I was out conducting chemical warfare on the insidious spurge in the back of my property the other day when I just happened to stumble across two tiny volunteers poking up through mats of dead spurge. One was a mesquite (which just blew me away!) and the other was a palo verde. I also found a third volunteer palo verde that I had given up for dead last year. My 1.25 acre property was stomped flat by horses a decade ago and is only just coming back on its own (with the help I can afford).
I hope these guys are a sign of things to come!
Here is a link that might be useful: my tiny baby trees