Snow in August?

I've been fighting to keep a little snow in our garden - Snow-on-the-mountain, that is, otherwise known as Euphorbia Marginata. Much as he loves prairie wildflowers, my husband refers to this one as a weed...or a pest...or worse. Last summer we had three huge plants that went to seed, so Ken has been yanking the sprouts as fast as they pop up. But a few managed to sneak by and I think I've persuaded him to let them stay for a few weeks as long as I promise we can eradicate them before they self-seed. I know they can take over a whole pasture in short time, but they sure are pretty. And with the hot spell we've been having, I'll take any kind of snow I can get!