different types of street trees shall be required for adjoining blocks

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Section 4.176. Landscaping, Screening, and Buffering. C HAPTER 4 3 P LANNING AND L AND D EVELOPMENT P AGE C 3 55 G ENERAL D EVELOPMENT R EGULATIONS U PDATED J ANUARY 2007 different types of street trees shall be required for adjoining blocks in a development.

1. All trees shall be standard base grafted, well branched and typical of their type as described in current AAN Standards and shall be balled and burlapped (b&b). Street trees shall be planted at sizes in accordance with the following standards: a.

Arterial streets - 3" minimum caliper b. Collector streets - 2" minimum caliper. c.

Local streets - 1-3/4" minimum caliper. d. Accent or median tree -1-3/4 d minimum caliper.

2. The following trees and varieties thereof are considered satisfactory street trees in most circumstances; however, other varieties and species are encouraged and will be considered: a. Trees over 50 feet mature height: Quercus garryana (Native Oregon White Oak), Quercus rubra borealis ( Red Oak), Acer Macrophylum (Native Big Leaf Maple), Acer nigrum (Green Column Black Maple), Fraxinus americanus (White Ash), Fraxinus pennsylvannica 'Marshall' (Marshall Seedless Green Ash), Quercus coccinea ( Scarlet Oak), Quercus pulustris (Pin Oak), Tilia americana (American Linden).

b. Trees under 50 feet mature ... more. less.

height: Acer rubrum (Red Sunset Maple), Cornus nuttallii (NativePacific Dogwood), Gleditsia triacanthos (Honey Locust), Pyrus calleryana 'Bradford' (Bradford Pear), Tilia cordata (Little Leaf Linden), Fraxinus oxycarpa (Flame Ash). c. Other street tree species. Other species may be specified for use in certain situations. For instance, evergreen species may be specified where year- round color is desirable and no adverse effect on solar access is anticipated. Water-loving species may be specified in low locations where wet soil conditions are anticipated. [Section 4.176(.06)(D.) am ended by Ordinance No. 538, 2/21/02.] E. Types of Plant Species. 1. Existing landscaping or native vegetation may be used to meet these standards, if protected and maintained during the construction phase of the development and if the plant species do not include any that have been listed by the City as prohibited. The existing native and non-native vegetation to be incorporated into the landscaping shall be identified. 2. Selection of plant materials. Landscape materials shall be selected and sited to produce hardy and drought-tolerant landscaping. Selection shall be based on soil characteristics, maintenance requirements, exposure to sun and wind, slope and contours of the site, and compatibility with other vegetation that will remain on the site. Suggested species lists for street trees, shrubs and groundcovers shall be provided by the City of Wilsonville. 3. Prohibited plant materials. The City may establish a list of plants that are prohibited in landscaped areas. Plants may be prohibited because they are

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