I have this in a flower bed that gets full sun and quite a bit of water, and it had done great! Maybe it just depends on where you live regarding the water? I planted a Monarda next to it without thinking, and the Monarda seems to want to be watered every couple of days. So, the Blue-eyed Grass is also getting watered that often, and hasn't suffered at all from it. It's very arid where I live, so maybe that is why it has survived with all that water?
I'm glad to know that it's easy to start from seed, so I'll be giving that a try next winter! I don't think it's reseeded for me, but it's possible that I've pulled up seedlings, thinking it was grass.