Stormwater retention is a hot-button issue among landscape architects. It’s something that all designers need to consider and can pose challenges on specific sites as well as in larger ecological systems. As landscape architects, we strive to implement creative practices to mitigate stormwater issues.
The planted retention/infiltration practice is one familiar to us all; however, this practice comes with its own unique set of care and maintenance issues. Enter the new guide from Cornell University’s Urban Horticulture Institute (UHI): “Woody Shrubs for Stormwater Retention Practices: Northeast and Mid-Atlantic Regions.” This guide by authors Ethan M. Dropkin and Nina Bassuk of Cornell University includes helpful information about issues associated with stormwater, various mitigation practices, and an extensive plant list.
In the past, designers have tended to select wet site-tolerant plants for these installations; however, while bioswale soils may be wet for brief periods, they are more often very dry between rainfall events. The authors tested several plants for their wet and dry tolerance and developed a bulletin describing many woody plants that are well-adapted to these conditions of alternately wet and dry soils.