Ava, I have some in a pot and like Nutcutlet says , once established , it will spread like crazy. The first year I planted it nothing happened but I was advised to leave it until the following year . Glad I did because now it comes up every year and has grown into a nice clump.
They don't like rich soil and I have never fed mine or re-potted it but it comes up and flowers every year now. 
Maybe you could try doing this and transplant it once estabished ?