Hi John-
I have ice plant (and a few weeds) on my hillside, too. David is
right in that the plant has almost no root system. In fact, mine
grows right over large rocks without any soil, so it's obvious that
they don't even care if they have dirt to grow in. I am in a very dry
climate, so water-soaked plants sliding down the hill is not an issue
for me. As far as the weeds go, I get out there about once every 2
weeks or so with my dandelion digger to irradicate them. At first, it
seemed like a bit of a chore, but by keeping up with it and not let
the weeds get the upper hand, it's no big deal now, as long as I
remember to do it.
Gary