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• water supply and watered sufficiently to ensure continuous healthy growth and <br />development. Maintenance shall include the replacement of all dead plant material <br />needed to meet the requirements of this Article. Should a tree die or be removed for <br />which credit has been obtained pursuant to this Land Development Code, trees sufficient <br />to equal the area credited shall be required. A smaller tree that will have a mature crown <br />similar to the tree removed may be substituted if the planting area or pervious cover <br />provided for the larger tree is retained; such substitution shall require the approval of the <br />Planning Director. <br />(c) Planting Criteria. <br />(1) Trees. Trees planted for credit under Section 6.1.1.4 shall be a minimum of two <br /> inches in caliper, measured six inches above ground level, and six feet in height <br /> when measured immediately after planting. Trees shall have an average mature <br /> crown greater than 15 feet. Trees having an average mature crown less than 15 <br /> feet may be substituted by grouping the trees so as to create at maturity the <br /> equivalent of a 15-foot crown if the drip line area is maintained. <br />(2) Shrubs, vines and ground cover. Shrubs, vines and ground cover planted <br /> pursuant to this Article should be good, healthy nursery stock. Shrubs must be, at <br /> a minimum, a one-gallon container size at the time of planting. <br />(3) Grass. Grass areas are encouraged to be planted in species normally grown as <br /> permanent lawns in the City, including Zoysia, Bermuda or other drought-tolerant <br /> grass. <br /> a. Grass areas may be sodded, plugged, sprigged or seeded, except that <br />• solid sod shall be used in swales, other areas subject to erosion, or as <br /> required in a Watershed Protection Plan. <br /> b. In new residential developments, developers and homebuilders are <br /> encouraged to offer low-water use landscape alternatives, such as Zoysia <br /> or buffalo grass. <br />(4) Synthetic lawns or plants. Synthetic or artificial lawns or plants shall not be used <br /> in lieu of plant requirements in this Section. <br />(5) Soils. New landscaped areas should be prepared so as to achieve a soil depth of <br /> at least six inches. The six-inch soil depth should consist of 75% soil blended <br /> with 25% compost. <br />(6) Architectural planters. The use of architectural planters may be permitted in <br /> fulfillment of landscape requirements. <br />(7) Turf areas. Except in residential developments, turf areas should be limited to a <br /> maximum of 50% of the total required landscaped area. <br />(8) Xersscape materials. Developers and homebuilders are encouraged to use <br /> xeriscape plant materials on model homes to promote use of water-wise <br /> landscaping. <br />(9) Other. <br /> a. Any approved decorative aggregate or pervious brick pavers shall qualify <br />• for landscaping credit if contained in planting areas, but no credit shall be <br /> given for concrete or other impervious surfaces.