Hello Dan, funny you should mention this as I was thinking this afternoon while picking Green Frills mustard, how easy and abundant it is from one plant per clump.
Whereas spinach leaves do grow a bit big for salad esp by March so two max works well here. For same reason I do 2 or 3 Broad Leaved sorrel per clump, for salad.
Dill is ok as one or two.
Happy sowing!
