Laserfiche WebLink
City of Tukwila My WebLink |HelpSearch Tips |About |Sign Out
III. LANDSCAPE/SITE TREATMENT <br />Fig. 33: A typical shrub hedge separating use <br />areas with standard nursery stock. <br />7. Grass seeding should only be permitted between <br />April 1st and October 15th to assure germination. <br />Some form of erosion control will be necessary if <br />seeding is not completed during this period. Hydro - <br />seeding or mechanical spreading should be used on <br />• _ <br />slopes. <br />8. Shrubs planted to define spaces or separate <br />environments should be planted as a staggered double <br />row whenever possible. This provides the significant <br />depth especially necessary to separate environments <br />such as parking areas from grassed fields and building <br />entries. <br />These shrubs should be spaced to provide a lush <br />continuous band within 3 years. This could be reflected <br />in a double staggered row of plants for typical nursery <br />stock spaced a maximum of 36 inches on center, <br />depending on the specific material. <br />9. Shrub beds should be no more than a two feet wide <br />per typical row of nursery stock plants, in order to <br />minimize barked area and maximize live ground cover. <br />A typical five foot wide barked planting bed for a <br />single row of shrubs is not acceptable. <br />10. Plant materials should generally include native <br />drought resistant species. <br />11. The native character of hillsides, ravines and <br />wetlands should be protected and enhanced to provide <br />habitat for a wide range of wildlife. Invasion and <br />takeover by more vigorously growing non-native <br />species such as English ivy; St. John's wort, and <br />Himalayan blackberry tend to exclusively promote <br />habitat for various rodent species. <br />12. Only native species which enhance a diverse habitat <br />should be planted on the remaining natural hillsides, <br />ravines, and wetlands. Plant buffer areas where the <br />selection of introduced species is carefully reviewed for <br />potential invasion of such natural areas should be <br />recognized on a site -by -site basis by the landscape <br />architect. <br />22 <br />