Gravel on the greenhouse floor??
I already have a base which is concrete for my new greenhouse, however I have seen some pictures with gravel on the GH floor and have read a thread from last year re a new base. With me already having a base, will that be suitable as it is or would I be better putting gravel down on top of it. What purpose does it serve exactly (I think it may hold more moisture for in the summer when (hopefully) it's hot but not sure?? Thanks in advance and apologies for another silly question!!