Chapter 21.43
LANDSCAPING

Sections:

21.43.010    Purpose and intent.

21.43.020    Applicability.

21.43.030    Landscaping submittal requirements.

21.43.040    Landscaping – General requirements.

21.43.050    Perimeter landscaping.

21.43.060    Landscape – Types.

21.43.070    Surface parking areas.

21.43.080    Alternative compliance.

21.43.090    Landscaping adjacent to public trails, utilities and other publicly used lands.

21.43.100    Landscape and tree protection during construction.

21.43.110    Landscaping – Irrigation.

21.43.120    Landscaping – Planting and installation.

21.43.130    Landscape maintenance.

21.43.140    Bonds – Security.

21.43.150    Penalties.

21.43.010 Purpose and intent.

(1) Introduction and Purpose. Landscaping is a key component of Woodinville’s northwest woodland character. The purpose of this chapter is to preserve and improve the aesthetic character and environmental quality of Woodinville’s neighborhoods through retaining and protecting existing vegetation and significant trees when possible; promoting of proper plant selection and continuous maintenance; reducing the impacts of development on drainage systems and natural habitats; increasing privacy for low-density zones; providing visual relief from parking lots and service areas; softening perceived building scale; and providing transition between different zones. (Ord. 622 § 4, 2016; Ord. 611 § 8 (Att. A), 2016)

21.43.020 Applicability.

(1) General. Any construction, site disturbance, or landscape removal within multifamily, commercial, industrial, and public/institutional zones (R-12 through R-48, CBD, NB, GB, I, or TB zones) or nonresidential development in residential zones shall be subject to the provisions of this chapter. The City has established three thresholds to gauge the extent of construction work and set requirements based on the level of improvement. Where a project qualifies for multiple thresholds, the requirement providing the largest area of landscaping improvement shall qualify.

(a) Major Construction. All development qualifying as major construction shall be subject to all of the provisions of this chapter for the entire site or lot. Major construction shall include projects where:

(i) A new development project is subject to site plan review pursuant to WMC 21.82.120 or 21.83.040; and

(ii) Land disturbing activities including removal or replacement of impervious surface on the site totaling more than 50 percent of the surface area of the site.

(b) Minor Construction. All development qualifying as minor construction shall be subject to the provisions of this chapter for the impacted areas only. Minor construction shall include projects where:

(i) The development does not qualify as major construction pursuant to subsection (1)(a) of this section. Such projects shall be subject to all of the provisions of this chapter only within the limits of disturbance. The limits of disturbance shall include portions of the site 10 feet beyond the area of construction, grading, site disturbance, or dripline for tree removal; or

(ii) A remodel or tenant improvement to an existing building exceeds 25 percent of the fair market value of all structures on the site. Sites not meeting the landscaping standards shall be required to provide additional landscaping on the site equal to 25 percent of the cost of construction.

(c) Pruning and Maintenance. On sites with no construction, impacted area shall be replanted to meet the landscaping type as provided in this chapter. The impacted area shall be considered the dripline of any removed shrub or the critical root zone of any removed tree. Enlargement of landscape areas shall not be required. Pruning shall be subject to WMC 21.43.130 and 21.50.130.

(i) A tree removal permit shall be required on sites where significant trees greater than six inches at diameter-at-breast-height are proposed for removal.

(ii) A tree removal permit shall not be required on sites where shrubs, groundcovers, or nonsignificant trees are proposed for removal.

(2) Emergency Removal. Any tree that poses an imminent threat to life or property, due to a storm event such as a windstorm or ice storm, may be removed without first obtaining a permit. The party removing the tree shall contact the City Tree Official within seven days of removal to provide documentation of threat for approval of exemption.

(3) Deviations. Deviation requests from these standards may be granted by the City Tree Official where strict application of these standards will conflict with existing development or landscaping, and are contrary to the purpose and intent of this chapter. (Ord. 706 § 40, 2020; Ord. 622 § 4, 2016; Ord. 611 § 8 (Att. A), 2016)

21.43.030 Landscaping submittal requirements.

(1) Submittal Materials. The following materials must be submitted as part of applications for construction permits. The City Tree Official shall have the authority to waive certain application materials if the item is not necessary to evaluate a specific proposal for consistency with this chapter.

(a) Site plan prepared by a licensed certified landscape architect or arborist, showing the following:

(i) Location of all existing and proposed structures, construction limits, easements, utility lines, and construction protection barriers consistent with WMC 21.43.120;

(ii) Location of all trees six inches or greater at diameter-at-breast height (DBH) within 50 feet of the construction limits, including size and species;

(iii) Identification of all trees to be removed and/or relocated;

(iv) Existing and proposed topography at five-foot intervals; and

(v) Location of all critical areas and buffers.

(b) Replanting plan, showing the following:

(i) Location of proposed structures and retained trees;

(ii) Location of proposed replacement trees and/or vegetation, including species, size, and spacing;

(iii) Location and design of other landscape restoration measures;

(iv) A planting schedule that indicates species, quantity, size, spacing, and tree density calculations for replanted trees; and

(v) Irrigation system, including location and specifications;

(c) Arborist report or professional recommendation, evaluating the following:

(i) Inventory of all impacted trees, including size, species, dripline, and critical root zone. The inventory must include all trees proposed for removal and any trees within 50 feet of the construction limits. Written evaluation of anticipated impacts to tree health and viability resulting from construction, including any impacts to critical root zones;

(ii) Information on compliance with coverage requirements, including a calculation of tree canopy or replanting schedule;

(iii) Evaluation of impacts on dripline and critical root zone of trees on adjoining properties;

(iv) Suggested location and species of supplemental trees, maintenance, and planting specifications consistent with WMC 21.43.120 and 21.43.130;

(v) Recommendations on tree protection measures consistent with WMC 21.50.120 and corresponding to the site plan in subsection (1)(a) of this section;

(vi) Special instructions for working within the protection area, including but not limited to, hand-digging, tunneling, root pruning, and minimizing grade changes;

(vii) Information on any required on-site supervision during construction;

(viii) Information on maintenance including duration, benchmarks for success, cost estimates, and financial guarantees/bonding; and

(ix) If applicable, assessment and designation of a hazard or nuisance tree. (Ord. 622 § 4, 2016; Ord. 611 § 8 (Att. A), 2016)

21.43.040 Landscaping – General requirements.

Landscape designs shall conform to the following provisions:

(1) Minimum Landscape Area. At least ten percent of the total site area, excluding areas dedicated as right-of-way, shall be landscaped pursuant to this chapter. Where no landscaping type is specified in this chapter, landscaping shall be Type III or greater;

(2) Planting Selection. Plant species shall be selected that enhance the City’s Northwest woodland character. Plant species must be either native or non-invasive naturalized species to the coastal region of the Pacific Northwest. Species shall be selected from the City of Woodinville Plant Species List or be suitable in the USDA Plant Hardiness Zone 8. At least 60 percent of new landscaping materials shall consist of drought-tolerant species, except where site conditions within the required landscape areas assure adequate moisture for growth. Drought-tolerant and nondrought-tolerant species shall be distributed and irrigated in a manner that uses water efficiently;

(3) Retention of Existing Vegetation. Healthy native vegetation shall be preserved to the greatest extent feasible. New vegetation should be replanted in between existing vegetation consistent with the required landscape type in random patterns where possible;

(4) Continuity. Landscaping shall be designed to provide continuity between adjoining properties;

(5) Pedestrian Areas. Building entries, pedestrian plazas and walkways shall be emphasized with special landscaping and/or paving in combination with landscaping;

(6) Staggered Rows. When the width of any landscape strip is 25 feet or greater, the required trees shall be staggered in two or more rows;

(7) Maximum Hardscape. No more than 15 percent of the width of any required landscaping areas shall be covered with walkways, driveways, or other impervious surfaces necessary for access. No other impervious surfaces or hardscapes are permitted in required landscaping areas;

(8) Areas of a site designated for landscape area shall be protected from disturbance during grading and construction to the extent feasible;

(9) Turf may be used as groundcover in landscape areas; provided, that the turf area:

(a) Constitutes no more than 30 percent of Type I and II landscape areas; and

(b) Is at least five feet wide at the smallest dimension;

(10) Bioretention facilities are allowed and encouraged to be located within landscaping areas. Landscaping shall be designed to be consistent with landscaping types and widths identified in this chapter. Where bioretention is used, shrub height shall be limited to four feet above the grade surrounding the facility and the spacing of trees and shrubs adjacent to the facility may be relaxed to help ensure adequate sunlight to the facility and to avoid leaf drop;

(11) All fences shall be placed on the inward side of any required perimeter landscaping;

(12) Berms shall not exceed a slope of three horizontal feet to one vertical foot for lawns and shall not exceed a slope of two horizontal feet to one vertical foot for other plant materials;

(13) Soils in landscape areas shall be amended with compost in accordance with Chapter 13.05 WMC;

(14) Landscape areas shall be covered with at least two inches of mulch to minimize evaporation. Mulch shall consist of materials such as yard waste, sawdust and/or manure that is fully composted;

(15) Required street landscaping may be placed within City of Woodinville street rights-of-way subject to the City’s street design standards with the permission of the Public Works Director, provided adequate space is maintained along the street line on site to replace the required landscaping should subsequent street improvements require the removal of landscaping within the rights-of-way; and

(16) A qualified tree professional, as defined in WMC 21.11.190, shall be on-site during any site work affecting preserved trees. (Ord. 634 § 36, 2016; Ord. 622 § 4, 2016; Ord. 611 § 8 (Att. A), 2016)

21.43.050 Perimeter landscaping.

(1) Except as otherwise provided in this chapter, landscaping along property lines shall be provided based on zoning districts set forth in this section. If listed in Table 21.43.050(1), perimeter landscaping shall be required for the subject street frontage or along the interior lot line identified in parentheses.

Table 21.43.050(1) – Perimeter Landscaping Requirements 

Zoning District of Subject Property

Required Perimeter Landscaping

Street Frontage

Interior Lot Lines

Special Standards and Notes

Nonresidential Development in Single-Family Zones (R-1 through R-8)

10 feet Type III (all streets)

20 feet Type I (R-1 through R-8 zones)

1. For single-family uses, refer to Chapter 21.50 WMC, Development Standards – Tree Protection.

Multifamily (R-12 through R-48)

10 feet Type III (all streets)

20 feet Type II (single-family zones)

10 feet Type II (other multifamily zones)

 

General Business (GB)

25 feet Type II (SR 522)

10 feet Type II (all other streets)

10 feet Type I (Public Park/Open Space)

2. For lots adjacent to SR 522, 0 – 25 feet Type II landscaping required per WMC 21.43.050(4).

Neighborhood Business (NB)

10 feet Type III (all streets)

20 feet Type I (R-1 through R-8 zones)

 

Industrial (I)

See Notes 3 through 6

25 feet Type II (SR 202)

10 feet Type II (all other streets)

20 feet Type I (R-1 through R-8 zones)

10 feet Type II (Industrial)

15 feet Type II (public trails or other publicly used lands)

3. Refer to Industrial Design Standards for additional requirements.

4. For properties in the Tourist District Overlay, refer to WMC 21.26.010.

5. Interior landscaping abutting industrial or public trails may be reduced to 5 feet depending on the intensity of the use to be screened, visual impacts, and if development is integrated with the subject abutting property through provision of pedestrian connections. Exceptions may be made for those developments meeting Section IV.F of the Industrial Design Guidelines and Standards.

Tourist Business (TB)

See Notes

See Notes

6. Refer to WMC 21.26.010.

Central Business District (CBD)

See Notes

20 feet Type I (R-1 through R-8 zones)

7. Refer to Chapter 21.40 WMC, Commercial Design Standards.

Public Park/Open Space (P)

 

10 feet Type I (R-1 through R-8 zones)

 

Public Institutional (P/I)

10 feet Type II (all streets)

20 feet Type I (R-1 through R-8 zones)

 

(2) Frontage Landscaping. Required street frontage landscaping may be placed within City of Woodinville street rights-of-way subject to the City’s street design standards with the permission of the Public Works Director, provided adequate space is maintained along the street line on site to replace the required landscaping should subsequent street improvements require the removal of landscaping within the rights-of-way.

(3) Street Trees. Street trees shall be planted in the right-of-way for all development fronting a public street at an average rate of one tree per 25 lineal feet. Street tree species shall be approved by the City Tree Official in accordance with the City of Woodinville Plant Species List or adopted street tree plan, if applicable. The trees may be spaced at irregular intervals in order to accommodate sight distance requirements for driveways and intersections.

(4) State Route 522. All developments shall provide a minimum of 25 feet of Type III landscaping adjacent to a SR 522 right-of-way. Developments may reduce the required landscaping width to zero feet provided the following requirements are met:

(a) A development agreement between the City and property owner is required, in which the property owner agrees to construct and maintain at the property owner’s expense a landscape buffer in the State of Washington Department of Transportation (DOT) right-of-way.

(b) The agreement shall be at the City’s discretion and would include provisions allowing the City to conduct the landscape maintenance, in which case a fee for these maintenance services will be agreed upon between the property owner and the City prior to acceptance of the agreement by the City Council.

(c) The provisions of the agreement shall be designated as covenants running with the land of the property owner binding the successors and assigns of the property owner, including mortgagees and beneficiaries of a deed of trust.

(d) An agreement will be required by DOT to allow the installation and maintenance of the landscaping in the DOT right-of-way. Typically, this agreement would be between DOT and the City.

(5) Site Constraints. The landscaping requirement may be modified when existing conditions on or adjacent to the site, such as significant topographic differences, vegetation, structures or utilities would render application of this chapter ineffective or result in scenic view obstruction. When an existing structure precludes installation of the total amount of required site perimeter landscaping, such landscaping material shall be incorporated on another portion of the site.

(6) Averaging. The width of the perimeter landscaping may be averaged, provided the minimum width is not less than five feet.

(7) Sites Under Common Ownership. Adjoining parcels under a binding site plan or those designed under common ownership may have perimeter landscaping located at the project limits and not the joint property lines. (Ord. 622 § 4, 2016; Ord. 611 § 8 (Att. A), 2016)

21.43.060 Landscape – Types.

(1) Landscaping Types. The types, arrangement, and quantity of plants shall be appropriate to the size and intent of the landscaping as indicated in Table 21.43.060(1). Alternative landscaping options in WMC 21.43.080 meeting the intent of subject landscape type may be substituted.

Table 21.43.060(1) – Landscape Types 

 

Type I

Type II

Type III

Intent

A “full screen” that functions as a visual barrier. Type I landscaping shall consist of a mix of primarily evergreen trees and shrubs placed to form a continuous screen.

A “filtered screen” that functions as a visual separator. Type II landscaping shall consist of a mix of evergreen and deciduous trees and shrubs spaced to create a filtered screen.

A “see-through buffer” that functions as a partial visual separator to soften the appearance of parking areas and building elevations. Type III landscaping shall consist of a mix of evergreen and/or deciduous trees spaced to create a continuous canopy.

Tree ratio

Minimum 70 percent evergreen trees

At least 50 percent deciduous trees and at least 30 percent evergreen trees

At least 70 percent deciduous trees

Tree size and spacing

Trees spaced no further than 20 feet on center.

Deciduous trees shall be at least 2-inch caliper.

Evergreen trees shall be at least 6 feet in height.

Multi-stemmed trees shall be at least seven feet in height.

Trees spaced no further than 25 feet on center.

Deciduous trees shall be at least 2-inch caliper.

Evergreen trees shall be at least 6 feet in height.

Multi-stemmed trees shall be at least seven feet in height.

Trees spaced no further than 25 feet on center.

Deciduous trees shall be at least 2-inch caliper.

Evergreen trees shall be at least 6 feet in height.

Multi-stemmed trees shall be at least seven feet in height.

Shrubs

Evergreen shrubs spaced no further than five feet apart.

Shrubs shall be at least 24 inches in height.

Shrubs spaced no further than seven feet apart.

Shrubs shall be at least 24 inches in height.

Shrubs, that do not exceed a height of four feet, spaced no further than four feet apart.

Shrubs shall be at least 24 inches in height.

Groundcovers

Four-inch pots spaced 24 inches on center.

Turf may constitute no more than 30 percent.

Four-inch pots spaced 24 inches on center.

Turf may constitute no more than 30 percent.

Four-inch pots spaced 24 inches on center.

Turf may constitute no more than 30 percent.

(Ord. 634 § 37, 2016; Ord. 622 § 4, 2016; Ord. 611 § 8 (Att. A), 2016)

21.43.070 Surface parking areas.

(1) General. Surface parking lots shall be landscaped to break up large areas of asphalt and to provide visual relief from the street.

(2) Required Plantings. Landscaping shall be provided within surface parking lots at a rate of 20 square feet per parking stall. Landscaping shall be designed and maintained to provide clear sight distance between three and one-half feet and eight feet above the existing street grade pursuant to WMC 21.22.190. Surface parking lot landscaping shall be planted as follows:

(a) Deciduous trees shall be planted at a rate of one tree per every seven stalls;

(b) Shrubs planted no more than four feet apart; and

(c) Groundcovers planted no more than 24 inches apart.

(3) Landscape Spacing. Landscape islands shall be spaced no further than 10 parking stalls and at the end of each parking row. Landscaping strips may be placed in between rows of parking stalls.

(4) Size. Landscape islands or strips shall be a minimum of four feet wide and shall have an area of at least 75 square feet.

Figure 21.43.070 Parking Lot Landscaping

(5) Bioretention Facilities. Parking area landscaping may be used for stormwater management as approved by the Public Works Director. The requirements for plant sizes and spacing in subsection (2) of this section may be relaxed for bioretention facilities upon recommendations provided by an arborist, landscape architect, or other qualified professional.

(6) Vertical Curbs. Landscape islands or planters shall be surrounded by a standard vertical curb or a similar barrier to protect the plantings from vehicle overhang. Gaps in the curb are permitted for stormwater drainage.

(7) Parking Perimeter Landscaping. If no perimeter landscape standard is listed in WMC 21.43.050 and if permitted, parking lots adjacent to sidewalks or streets shall be screened with a minimum of 10 feet of Type III landscaping or five feet of Type III landscaping with a three-foot-tall decorative wall, unless otherwise required by this title. (Ord. 634 § 38, 2016; Ord. 622 § 4, 2016; Ord. 611 § 8 (Att. A), 2016)

21.43.080 Alternative compliance.

(1) The following alternative landscape options may be allowed only if they accomplish or exceed the intent of the landscaping type and are subject to Development Services Director approval:

(a) Landscaping areas may be used for stormwater management as approved by the Public Works Director. The requirements for plant sizes and spacing may be relaxed upon recommendations provided by an arborist, landscape architect, or other qualified professional.

(b) Development with green roofs or rooftop gardens covering at least 50 percent of all building roofs may reduce the required landscaping area by 10 percent.

(c) Development with living walls or green walls covering at least 15 percent of all building walls may reduce the required landscaping area by five percent.

(d) The width of the perimeter landscape strip may be reduced up to 25 percent along any portion where:

(i) Berms at least three feet in height or architectural barriers at least four feet in height are incorporated into the landscape design; and

(ii) The landscape materials are incorporated elsewhere on site.

(e) Sites retaining 10 significant trees per acre or a grove per acre may reduce required landscape area by up to 10 percent.

(f) Street perimeter landscaping may be waived, provided a site plan is approved that provides a significant amount of other pedestrian-related amenities and the landscaping is incorporated elsewhere on site.

(g) Alternative landscape spacing under the recommendation of a landscape architect or arborist may be approved if spacing will ensure long-term landscape health and provide equivalent screening. (Ord. 622 § 4, 2016; Ord. 611 § 8 (Att. A), 2016)

21.43.090 Landscaping adjacent to public trails, utilities and other publicly used lands.

(1) All developments adjacent to publicly used trails and other public lands shall provide landscaping adjacent to and along the building facade that faces the trail or land at the rate of at least one tree per 50 feet of facade. Exceptions may be made for those developments meeting Section IV.F of the City’s Design Guidelines and Standards.

(2) All development shall provide, at a minimum depending upon the intensity of use to be screened, Type III landscape screening from public areas, etc., to reduce off-site visual impacts. The applicant shall propose the type of landscaping to be provided for approval by the City Tree Official.

(3) Utility purveyors within the City of Woodinville are required to maintain and plant landscaping within their right-of-way as follows:

(a) Limited disturbance of vegetation to that necessary for safety and maintenance of transmission lines;

(b) Prune trees to direct growth away from utility lines using accepted pruning practices identified in the public tree care standards manual;

(c) Phase replacement of vegetation located improperly in the right-of-way;

(d) Use approved soil amending techniques to assure water retention and general tree health;

(e) Prune trees in an aesthetic manner according to the professional arboricultural specifications and standards;

(f) Select tree species recommended by the City’s Tree Board or Public Spaces Commission or as approved by the City Tree Official that are compatible with utility lines, and plant using adequate recommended spacing;

(g) Provide the City with a copy of the utility’s policies and guidelines regarding tree pruning; and

(h) Present the City with a tree-pruning plan at least one week prior to tree-pruning activities. (Ord. 675 § 15, 2018; Ord. 634 § 39, 2016; Ord. 622 § 4, 2016; Ord. 611 § 8 (Att. A), 2016)

21.43.100 Landscape and tree protection during construction.

(1) Tree protection measures shall be installed prior to development activity or initiating vegetation removal on the site. These standards must be adhered to and included on grading and building plans as necessary. A pre-construction meeting on-site between the City Tree Official and the contractor shall be held prior to site disturbance.

(2) Tree protection measures shall include, but are not limited to, the following:

(a) Protective Barrier. A visible temporary protective fencing extending to the edge of the critical root zone of all retained trees shall be installed prior to site disturbance and maintained until removal is authorized by the City Tree Official. Visible signs shall be spaced no further than 25 feet along the entirety of the protective tree fence. Said signs must be approved by the City Tree Official and shall state at a minimum “Tree Protection Area, Entrance Prohibited” and provide the City phone number for code enforcement to report violations.

(b) Construction Activities. No excavation, storage, parking, construction vehicle access, dumping of toxic or polluted materials, or other potentially damaging activity is allowed within the protective barrier. If construction activity within the protective barrier is unavoidable, the City Tree Official may allow such activities approved by and the following activities under the supervision of a qualified tree professional retained by the applicant:

(i) Equipment may be authorized to operate within the critical root zone, if no other alternative is feasible. The areas adjoining the critical root zone of a tree shall be covered with mulch to a depth of at least six inches, or with plywood, metal or similar material in order to protect roots from damage caused by heavy equipment.

(ii) Utility trenches should be located outside of the critical root zone of trees. If utilities must be placed within the critical root zone, a qualified tree professional shall review the proposal to ensure the long-term viability of the trees. The work shall minimize root damage by excavating a two-foot-deep trench, at edge of critical root zone, to cleanly sever the tree roots.

(iii) Corrective pruning may be performed on protected trees in order to avoid damage from machinery or building activity.

(iv) Site grading within the critical root zone shall be the minimum necessary. The applicant’s qualified tree professional shall establish the maximum amount of earthwork allowable in the critical root zone that will not imperil the survival of the tree. Suitability of activities shall be based on construction techniques, erosion potential, damage to the critical root zone, stabilization techniques, and other similar factors.

(c) Exposed Soils. Trees and other vegetation to be retained shall be protected from erosion and sedimentation. Clearing activities shall be conducted so as to expose the smallest practical area of soil to erosion for the least possible time. To control erosion, it is encouraged that shrubs, groundcovers, and stumps be maintained on the individual lots, where feasible.

(d) Directional Felling. Directional felling of trees shall be used to avoid damage to trees designated for retention. Any trees designated for preservation, per the approved tree plan, that are significantly damaged or destroyed during felling of trees approved for removal shall be replaced per WMC 21.50.060.

(e) Additional Requirements. The City Tree Official may require additional protection measures that are consistent with accepted urban forestry practices. (Ord. 622 § 4, 2016; Ord. 611 § 8 (Att. A), 2016)

21.43.110 Landscaping – Irrigation.

(1) Landscape areas shall have permanent irrigation systems unless the applicant can demonstrate that temporary irrigation will be sufficient to establish plantings within two growing seasons. Temporary irrigation systems shall be removed after 24 months or two growing seasons, whichever occurs first; provided, that the plantings are established;

(2) Areas of undisturbed existing vegetation or areas where existing site conditions assure adequate soil moisture for growth within the required landscape area shall have temporary irrigation systems only as required to sustain new plantings and shall be determined on a case-by-case basis by the Development Services Director; and

(3) Areas of undisturbed existing vegetation, low areas with existing high soil moisture conditions, or landscape areas consisting of drought-tolerant vegetation shall not have permanent irrigation systems. Permanent irrigation systems may be permitted within all other required landscape areas; provided such systems shall be designed by a licensed landscape architect or certified irrigation designer and with:

(a) Moisture or precipitation sensors;

(b) Automatic timers set for operation during periods of minimum evaporation and that assure adequate moisture levels;

(c) Head-to-head spacing, if sprinkler heads are proposed;

(d) Pressure regulating devices;

(e) Backflow prevention devices; and

(f) Separate irrigation zones for:

(i) Turf and planting beds; and

(ii) Other nondrought-tolerant species. (Ord. 622 § 4, 2016; Ord. 611 § 8 (Att. A), 2016)

21.43.120 Landscaping – Planting and installation.

(1) Plant Size and Spacing. The required minimum size for any installed tree is two-inch caliper or greater and for any installed shrub is number two size. Trees shall be spaced appropriately based on the Woodinville Tree Species List.

(2) Installation. All required plantings shall be installed according to sound horticultural practices in a manner designed to encourage quick establishment and healthy plant growth.

(a) Placement. All supplemental trees shall be located at least seven feet from the property lines, and shall be installed in the ground and not in aboveground containers.

(b) Grading. Berms shall not exceed a slope of two horizontal feet to one vertical foot (2:1).

(c) Soil Specification. Soils in planting areas shall have adequate porosity to allow root growth and adequate drainage. Compacted soils shall be loosened to a minimum depth of 24 inches or to the depth of the largest plant root ball, whichever is greater. Imported topsoils shall be tilled into existing soils to prevent a distinct soil interface from forming. Existing soils shall be augmented with a two-inch layer of fully composted organic material rototilled a minimum of six inches deep.

(d) Soil Fertility. The organic content of soils in any planting area shall be as necessary to provide adequate nutrient and moisture-retention levels for the establishment of plantings. Additional fertilization shall be the minimum necessary.

(e) Mulch. Landscape areas shall be covered with at least two inches of mulch to minimize evaporation. Mulch shall consist of materials such as yard waste, sawdust, bark or wood chips, and/or organic compost. All mulches shall be kept at least six inches away from the trunks of shrubs and trees.

(f) Grass and groundcover areas shall contain at least two inches of composted organic material at finish grade.

(g) Protection. All required trees must be protected from potential damage by adjacent uses and development, including parking and storage areas. Protective devices such as bollards, wheel stops, trunk guards, and root guards, shall be required as needed to protect required trees.

(3) Supervision. A qualified tree professional, as defined in WMC 21.11.190, shall be on-site during any site work affecting preserved trees.

(4) Timing. Landscaping shall be installed prior to issuance of a certificate of occupancy for the project or project phase. The time limit for compliance may be extended to allow installation of landscaping during the next planting season or deferred due to diseased soil or pest infestation. A determination shall be made at the discretion of the City Tree Official. Deferred installation shall be secured with a performance bond pursuant to Chapter 15.42 WMC and WMC 21.43.140. (Ord. 634 § 40, 2016; Ord. 622 § 4, 2016; Ord. 611 § 8 (Att. A), 2016)

21.43.130 Landscape maintenance.

(1) The following maintenance requirements apply to all landscaping planted or preserved consistent with this chapter:

(a) Responsibility for Regular Maintenance. The applicant, landowner, or successors in interest shall be responsible for regular maintenance of landscaping and trees. Maintenance of all landscaping installed as part of a development project within the right-of-way shall be the responsibility of the abutting property owner unless alternative conditions are approved by the City. Maintenance of the vegetation and mulch within an LID facility installed as part of a development project within the right-of-way shall be the responsibility of the abutting property owner unless alternative conditions are approved by the City.

(b) Replacement. Planting materials that are dead shall be removed and replaced in-kind by the property owner, unless necessary for vegetation thinning. Plantings shall be replaced within three months or during the next planting season if the loss does not occur in a planting season.

(c) Maintenance Duration. All landscaping and trees shall be maintained for the life of the project. A maintenance guarantee pursuant to Chapter 15.42 or 21.60 WMC shall be secured for a period of three years following the issuance of the certificate of occupancy or plat recording.

(d) Non-native Invasive and Noxious Plants. It is the responsibility of the property owner to remove non-native invasive plants and noxious plants from the vicinity of any tree or other vegetation planted or preserved consistent with this chapter. Removal must be performed in a manner that will not harm the tree or other vegetation that the City has required to be planted or protected.

(e) Pruning. All landscape materials and trees shall be pruned as necessary to maintain a healthy growing condition, to prevent primary limb failure, and to maintain adequate sight distance. Topping or pruning to the extent that would constitute tree removal as defined in Chapter 21.11 WMC is prohibited. If a required tree smaller than six inches in diameter-at-breast-height is topped, it must be replaced. If a tree six inches or larger in diameter-at-breast-height is topped, the property owner may be subject to enforcement actions pursuant to WMC 21.50.140. Trees may be windowed or limbed up using best management practices. This method of tree pruning shall maintain the health of the tree.

(f) Landscape areas shall be kept free of weeds, trash, and debris.

(g) Maintenance of the vegetation and mulch within an LID facility installed as part of a development project within the right-of-way shall be the responsibility of the abutting property owner unless alternative conditions are approved by the City. (Ord. 634 § 41, 2016; Ord. 622 § 4, 2016; Ord. 611 § 8 (Att. A), 2016)

21.43.140 Bonds – Security.

(1) Performance Bond. A financial guarantee in the form of bond, cash deposit, or assignment of funds shall be submitted prior to issuance of any construction permits with landscaping improvements. The performance bond shall be equal to 150 percent of the estimated total cost of landscaping, including labor and materials. Prior to release of the performance bond, a maintenance and defect guarantee shall be in place.

(2) Maintenance Bond. Maintenance bonds or other appropriate security (including letters of credit and set-aside letters) shall be required for a period of three years after the planting or transplanting of vegetation to insure proper installation, establishment and maintenance. (Ord. 622 § 4, 2016; Ord. 611 § 8 (Att. A), 2016)

21.43.150 Penalties.

In accordance with enforcement regulations of Chapters 1.06 and 21.50 WMC, any person violating these regulations shall be subject to civil penalty procedures and fines. Each tree removed or damaged shall be considered a separate violation. (Ord. 622 § 4, 2016; Ord. 611 § 8 (Att. A), 2016)