material with a minimum of eight percent organic material cultivated a minimum of six inches deep; or ii. Have an existing organic content of eight percent or more to a depth of six inches as shown in a soil sample analysis. The soil analysis shall include:
a. 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. b. Single-stemmed trees required pursuant to this chapter shall at the time of planting conform to the following standards: i. In parking area landscaping and in street rights-of- way: a) Deciduous trees shall have a minimum caliper of 1.75 inches and a height of 10 feet; and b) Coniferous and broadleaf evergreens shall be at least five feet in height;
a) Determination of soil texture, indicating percentage of organic matter;
b) An approximated soil infiltration rate (either measured or derived from soil/texture/infiltration rate tables). A range of infiltration rates shall be noted where appropriate; and
c) Measure pH value.
c. Landscape areas, except turf or areas of established groundcover, shall be covered with at least two inches of City-approved mulch to minimize evaporation. d. Plants having similar water use characteristics shall be grouped together in distinct hydrozones. e. Plant selection shall consider adaptability to climatic, geologic, and topographical conditions of the site. Preservation of existing vegetation meeting the requirements of this chapter is required where feasible. 7. Landscaping – Additional standards for required landscape areas In addition to the general standards of SDC 21.06.020C.6., landscape areas required pursuant to SDC 21.06.020C.2. through 21.06.020C.5. shall conform to the following standards:
ii. In all other required landscape areas:
a) Deciduous trees shall have a minimum caliper of 1.5 inches and a height of 10 feet; and b) Coniferous and broadleaf evergreen trees shall be at least five feet in height. c. Multiple-stemmed trees shall be permitted as an option to single-stemmed trees; provided, that such multiple- stemmed trees are:
i. At least six feet in height; and
ii. Not allowed within street rights-of-way.
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