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Landscape designs for developments that are projected for construction and occupancy during the winter months shall avoid using frost-sensitive vegetative ground cover. If it cannot be avoided, planting schedules must be discussed with the PDSD to establish conditions of occupancy.
Trees and shrubs must be selected and located so that, at maturity, they do not interfere with existing on-
or off-
utility service lines or utility easements or with solar access, as defined in Section 11.4.20 of the Unified Development Code, to an adjacent property (see Figure 5-D, Conflicts with Utilities and Solar Access).
Vehicular and pedestrian safety factors from the following list must be incorporated into all landscape designs:
6.1 The positioning, location, and type of plant material, screening, and other landscape elements should allow for natural surveillance of the outdoor spaces from within buildings, from outdoor locations on-, and from adjacent buildings, , and rights-of-way.
6.2 Landscaping and screening should complement efforts to define public, semipublic, and private spaces.
6.3 Entrances to and exits from buildings or open spaces around buildings, including pedestrian walkways, should be open and in view of the surrounding neighboring or adjacent in order to reduce opportunities for crime.
6.4 Curbs, sidewalks, and landscaped trails should be used to define public, semipublic, and private areas.
6.5 Property owner/occupant areas of influence should be defined through the use of design elements, such as walls, fences, changes in or
, lights, color, or change in paving texture.
6.6 To allow maximum visibility and surveillance of the development, screening should be used that is no higher than required by this section unless high enough to create an effective barrier to entry.
6.7 In areas adjacent to doors and windows, applicants should select plant material of such height to retain visibility of building openings from the street or from other development (e.g., less than 30 inches or with a greater than six foot space between the ground and the canopy).
6.8 Shrubs and ground cover located within four feet of the edge of a walkway may not exceed 30 inches in height, except where other standards call for a greater height. An effort should be made to avoid a design requiring a greater height. Trees located less than 12 feet from the edge of a walkway must be trimmed to a minimum six foot canopy height. (See Figure 5-E, Pedestrian Safety Zone.)
6.9 Use of barrier plants (see Figure 5-F, Security Plant Materials) in areas adjacent to walkways is recommended with consideration for pedestrian safety in compliance with Section 5-01.8.0, Screening Safety Standards.
6.10 Unless adjacent to a pedestrian path, barrier plants must be planted below and extending at least 12 inches beyond each side of windows. Plant materials in this area may be no higher than the sill height of the window.
Trees may be planted in sight visibility triangles provided that:
7.1 The trunk caliper, at maturity, does not exceed 12 inches in diameter;
7.2 The lowest branch of any tree is at least six feet above the
of the street or driveway, whichever is the determining factor in the sight visibility triangle; and
7.3 Trees are not planted in a line that could result in a solid wall effect when viewed at an angle.
8.1 Vegetation, such as those with spines, thorns, or needles, that may present hazards to pedestrians, bicycles, or vehicles must be planted a safe distance from the outer branch tips to the edge of a walkway, or path, roadway, or parking area access lane (PAAL). The growing characteristics of the vegetation must be taken into consideration when determining this distance (see Figure 5-I, Safety Standards).
8.2 Shrubs or ground cover planted adjacent to a walkway, driveway, bicycle path, or street must be placed with the plant center at a distance equal to or greater than one-half the normal width of the plant, at maturity.
8.3 Shrubs or ground cover that spreads must be kept pruned to prevent encroachment upon walkways, bicycle paths, driveways, or streets.
8.4 Trees with the potential for overhanging a walkway, driveway, bicycle path, parking space, or street must be of a type that, at maturity, provides a canopy with an understory height clearance of eight feet for walkways and bicycle paths, 12 feet for driveways and streets, and 15 feet for loading spaces. The height clearance shall be maintained by pruning during the tree’s active growth period or when necessary.
8.5 In addition to the sight visibility triangle, no planted area may create a hazard by obstructing a driver’s view of oncoming pedestrians, bicyclists, or vehicles.
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