Are Chinese Asters a pain to keep growing?

I'm thinking of putting asters in between my two gardenia bushes in front of my house. If you have these growing, do you have to move them every year? And are they really prone to diseases? What other plants do you have them growing with?

Are Chinese Asters a pain to keep growing?
they can get floppy - and need support. But they bloom when few other things do (at least here in Detroit) so I put up with them anyway ;)
Reply:They'll do fine, you can prune them to the size you want. Leave them establish a good root system, usually three years, then you can divide them.