How do I renovate a rain garden that has become overgrown with weeds?
I am working on a 5-year-old rain garden at a school that was never taken care of it. I am clearing out weeds, etc. and I have two questions. 1) Should I cut it down to the ground this fall? It is spindly (some kind of grass has overtaken it) and needs some revitalization. 2) What is the best way to remove invasive thorn plants? I have removed them so seeds would not spread, but they will obviously sprout again. How do we try to get these to go away as best as possible? Note: I have removed weeds and tree saplings that do not belong.