Seed mixes for underdrained filter swales

So Mark Johnson of SMRT has put out a general question to the membership concerning seed mixes for underdrained filter swales; in specific, what has been working.

"We’ve been getting mixed reports on various seed types, but by and large, the nature of the growth/filter media and the inherently droughty condition makes it tough to get much to grow. The DEP is basically relying on “developers” to determine a successful specification, so they’re no help. I look forward to your input!" - Mark Johnson, SMRT-Portland

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