In two weeks, the parsley has gone to seed. It had been so robust that the clumps were like hedges. Now it's nearly unusable. We have to let it go to seed (there's nothing else to be done) and wait for the next risings of little clumps all over the garden, some even coming up through cracks in the drive. We use it profligately (super word) and then nothing.
Flat leaf parsley eclipsed curly in some sort of fashion takeover but I think we need both (and curly is easier to chop IMO).
In case your's is still around, here's what I do with parsley. Can you add some other ideas?