Hi Allison
Mine is coming along ok this year. I've had it for a few years now.
It gets morning sun, is in a flowerbed that has good drainage, the soil is loamy somewhat, sometimes it gets mulched with wood and happens to be planted next (approx. 6 inches or less away) to our concert steps.
I accidentally pulled one of the the stems while weeding this Spring and I was horrified when I realized what I did.
It's still ok though.
The flowerbed it's in, slopes downward;
I have an Echinacea plant next to it that is wilting and withering away, maybe there's something in the soil.
Wish I could help more. Let me know how it does. I got mine at HCG a few years ago and can't find any more elsewhere, as I wanted to have several in case this one died.
I have to remember to make sure it's well mulched, esp. in the Fall before Winter starts.
You could add some compost, add some gypsum (for drainage), add some all-purpose sand and add some of the water crystals to and around the soil of the plant.