I have it lining the front of my main rose bed. It hasn't gotten under the roses just yet, but I don't think it will be a problem. If it does, it's fairly east to dig it up (and move it somewhere else as it's a very good ground cover). It does spread horizontally under ground, so if you like having bare earth directly under your roses (for putting in fertilizer and such) you may want to keep it from growing directly under the roses. The main problem I have with my mondo bed is that it's been invaded by my bermuda grass (from underneath a 2 ft wide walkway, can you imagine!) and I have to keep pulling out the bermuda and other weeds. I'm hoping that the mondo gets so dense that it will crowd out the others. When I was at Biltmore, their rose garden had what I think was fescue at the front border of the rose beds. It appeared that they edged the fescue to keep it out from under the roses. I can't do that in my bed because of the mulch. But again, I hoping that the mondo will get so dense that I can forgo the mulch at some point in the future.

MG will not do well in full sun, must be kept moist and does not hold up well to traffic.

Kat - I have a source for it - around $10 for a six in pot. Let me know and I'll get some for the swap. You this plant needs full sun, all day long for really black color, right? Otherwise it goes back to green.

You're doing the right things for it. It's just slow. This will be a huge advantage once it is established since you won't have to fight to keep it where you want it. I'd hand weed it. Weed and Feed is for turf grass which is an entirely different plant.