Landscaping a Bioretention Area
Minimum 3 species of trees and shrubs (each)
Trees planted 12 feet on center (1000 stems/acre)
Native trees and shrubs selected for tolerance for:
- pollution
- ponding
- dry soil
Mulch layer typically shredded hardwood mulch
Locate plant material near perimeter but not at inflow
Care and replacement warranty (80% - one year)
Normal landscaping maintenance
Notes:
Plant material selection should be based on the goal of simulating a terrestrial forested community of native species. Bioretention simulates an ecosystem consisting of an upland-oriented community dominated by trees, but having a distinct community, or sub-canopy, of understory trees, shrubs and herbaceous materials. The intent is to establish a diverse, dense plant cover to treat stormwater runoff and withstand urban stresses from insect and disease infestations, drought, temperature, wind, and exposure. Other landscaping guidance is presented in this slide.