I just planted a set of very low water use grasses in my high desert zone 7B New Mexico yard. Some little spouts came up that I at first thought were one of the grasses, but it turns out they're weeds. Now I see that they're growing all over the neighborhood. Here's what a larger one looks like:
What is this thing called? And, more importantly to me, is there any reason why I should get rid of them? They're green, sprout without supplemental water, and are reasonably pretty. Unless they sprout thorns or totally die in the cold, I'm wondering if I should just keep them.