I have tried this before, but had no real success--maybe because of my extreme climate! So, I want to see the others' suggestions, too. Lbboodry, you might want to let us know what part of the States you garden in, since that will affect the instructions.

welcome to GoY :o)
they do better in dappled shade in soil that tends to stay reliably moist, rather than full sun or deep shade. I remove last years leaves as the flowers are starting to open so I can see the flowers better. then I regularly dead head them and after flowering I sometimes [if I remember] give then a light granular feed. then I just leave them to get on with it. Occasionally I will mulch around them with home produce leaf mould but that's all. I find them an undemanding plant but I guess it will depend on the State you are in. I am in on the east coast of Britain, so not too hot [haha] and plenty of rain fall.

They look after themselves here.Ours are in shade in summer from late afternoon, but not shaded in winter, and we get a lot of rain. They would not be happy in dry ground with full hot sun.