Recently I've noticed a BUNCH of mesquite coming up in my 10 acre pasture. There have been some mesquite there in the past, but it was cleaned out years ago. The pasture is pretty healthy - I treat it with 2,4-d twice a year and it's quite thick with a variety of grasses. But this spring, in several places, there are some little baby mesquite plants coming up. Most are just a few inches tall, but they're in little scattered clusters. Say 15-20 of them in a 10 foot circle, roughly. Where are they coming from? There aren't any beans or anything lying around. I'm wondering if the beans could be lying dormant underground for many years, then be "triggered" by recent heavy rains....?