There is a very small Leucophyllum that started growing as a volunteer in front of my porch. I've watered it now and then. It's now 5" x 5". I'd like to keep it but am wondering how big a plant it will be at maturity. Can anyone tell me which species of Leucophyllum this is from pictures below? I've had no luck finding a bush in neighborhood from whence it began. My guess is there may have been a Leucophyllum seed in a packet of annuals I planted last spring.