Development Standards—Landscaping and Irrigation | Town Center
4. Plants having similar water use characteristics shall be grouped together in distinct hydro zones. 5. Plant selection shall use exclusively native plants from the appropriate planting lists provide by the Washington Native Plant Society for the sites geography and climate. 6. Green roof landscaping standards pursuant to SDC 21.07.070C. (Type VII). G. Landscaping – Additional standards for required landscape areas In addition to the general standards of SDC 21.07.070F., landscape areas required pursuant to SDC 21.07.070C. through 21.07.070E. shall conform to the following standards:
b. In all other required landscape areas:
i. Deciduous trees shall have a minimum caliper of one and one-half inches and a height of 10 feet; and ii. Native coniferous and broadleaf evergreen trees shall be at least five feet in height or taller if used as a screen (see SDC 21.07.070C.1. and 2.). 4. Multiple-stemmed trees shall be permitted as an option to single-stemmed trees; provided, that such multiple- stemmed trees are:
a. At least six feet in height; and
b. Not allowed within street rights-of-way.
5. When the width of any landscape strip is 20 feet or greater, the required trees shall be staggered in two or more rows. 6. Shrubs shall be dwarf varieties unless demonstrated that other varieties can thrive if maintained at 42 inches. Shrubs shall also be as follows: a. At least an AAN container Class No. 2 size at time of planting in Type II, III and parking area landscaping; b. At least 24 inches in height at the time of planting for Type I landscaping; and c. In order to maintain a height not exceeding 42 inches when located in Type III or parking area landscaping.
1. No plants included in the King County noxious weed list.
2. All plants shall conform to American Association of Nurserymen (AAN) grades and standards as published in the “American Standard for Nursery Stock” manual; provided, that existing healthy vegetation used to augment new plantings shall not be required to meet the standards of this manual. 3. Single-stemmed trees required pursuant to this chapter shall at the time of planting conform to the following standards:
a. In parking area landscaping and in street rights-of-way:
i. Deciduous trees shall have a minimum caliper of one and three-fourths inches and a height of 10 feet; and ii. Coniferous and broadleaf evergreens shall be at least five feet in height;
7. Perennials.
Effective | January 1, 2022
Title 21: Sammamish Development Code | 515
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