Nancy,

I didn’t look through this site well, but I think it may offer some info for you:  There is a section on Management.

http://miscanthus.cfans.umn.edu/

I haven’t grown a lot of grasses because they get too big for the space I can a lot them. However, Last spring at a Rural King store I was surprised to see they had a variegated Acorus (Sweet Flag), or so it was labeled.  I hadn’t had one in years and was delighted, took it home and planted it.  Got taller than I expected. Then it flowered – not what I knew as acorus flowers.  Looked like a grass to me.  This year my “acorus” is 4 ft tall.  Very pretty, but it’s going to have to come out. I think this is a Miscanthus.   Plants with root systems like this, if I keep them, get dug every other year as I know that, beyond that, I’ll never get them out.  Joe Pyes are that way, too.

Kitty