Sporobolus heterolepis is a warm season, full sun grass. It's going to push much faster after a few more weeks of warming weather...still going to be a moderate speed grower at best. If they have doubled in height already in zone 7, they're doing just fine. They'll probably reach nearly 2' by August, and you'll see some late summer/early fall flowering. That's also the time when the foliage is going to look really interesting! They're not going to make huge clumps the first year.

I agree with grass guy, your dropseed is doing well if it's already doubled in size. It definitely likes the hot weather and good drainage. Be patient, it is well worth the wait. It's probably my favorite OG.

Thanks dawgie. From the photos I've seen of this grass, I think I'll love it.

BTW, my name is dawgie because I'm a Georgia grad (altho I live in NC now). Go Dawgs!

That's funny dawgie-I was wondering that when I saw your screenname!