How Sandy Does Bioretention Soil Need to Be?

Bioretention media is an important topic in the design world. As green infrastructure solutions gain acceptance, there is increased focus on finding the most effective media for on-site stormwater management. But there isn’t (yet) a lot of agreement on what the media consists of, and how to make it both functional for stormwater while being friendly for tree growth. Most of the debate is centered around how much fines (silt and clay) is allowable.

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