Use plant material that tolerates dry, poor soils, requires less water than most, and requires a minimum of maintenance. Limited susceptibility to insect and disease infestation and tolerance to salt exposure are desirable traits.
Use peat moss, manures or other organic matter as soil amendments to improve soil structure and increase water-retentive properties of soils.
Use bark or other mulches to aid in retaining soil moisture.
Limit use of fertilizer to avoid over-stimulating plant growth which in turn increases water requirements.
Employ proper watering practices, especially during establishment period. Water deeply to soak root zone and force roots to go deep.
Clearance from the Edge of the Travel Lane
Curb or Guardrail: 5' clearance necessary
Wildflower Plantings: No clearance necessary
Without Curb or Guardrail: 55 MPH - 30' from edge of travel lane
45 MPH - 20'
35 MPH - 15'
25 MPH - 15'
Island or Median Planting
Median: No trees or shrubs with caliper 4" or greater
Island: Ultimate height of shrubs to be no greater than 3'
Trees: Lowest branches to be higher than 6'-8" from finish sidewalk grade
Sidewalk Cutouts: 42' x 42'
Sidewalk Clearance: Minimum of 3' width needed for passage of wheelchairs
Height Limit under Utilities
Minimum height of tree to be less than lowest utility
Calculated at intersections according to American Association of State Highway and Transportation Officials (AASHTO) guidelines