Euphorbia invasion

Shortly after we moved to San Carlos, a plant emerged from the ground. I love the way it looks and I love that we didn't water it for two years and it survived. Apparently it's a Euphorbia:

A couple of years ago I noticed that in the Spring the plant started to have babies.  The first year I said to myself "wow, it'd be great to replant some of these babies to have more of these plants" (but I didn't do anything about it).  The second year I replanted one of the babies, but it didn't survive.  The third year, this year, my Type A personality took over and I replanted 19 babies to see if any survived.  18 out of 19 survived!  Does anyone want some Euphorbias?...