I am starting a reforestation project in the summer of 2017. The location will be in the Trans Pecos region of TX at an elevation of 3,000ft.

I am trying to start a collection of seeds of various plants to aid in this project. Specifically I'm looking for:

Acacia
Mesquite
Paleo Verde
Texas elbow/spring herald
Sesbania
Tamarind
Carob

I'm also open to various other desert thriving plants.

For trade I have:
4 various types of mimosa
Beautyberry
Elderberry
Pindo palm
Will soon have a semi large selection of cover crop seeds (crimson clover, sunflower, buckwheat, sunn hemp, hairy vetch)

I can mail you 20 to 30 seeds for each of the following nitrogen fixers, if you are interested.  Viability has not been tested, but all seeds are fresh, and both plants are considered drought tolerant.

Texas Mountain Laurel
Goldenball Leadtree

Does the temp ever fall to freezing there?

Will, thank you, I'll pm you with my info.

Steve- there are a couple weeks in January where low 30's temps are a possibility. However, with a 4-6" layer of mulch I think I'll escape losing plants which don't tolerate frost. Between the microbial activity of the soil and the insulation the mulch, at least here in FL, I can keep my soil 7-8° warmer in the winter time.

For an example, I fully anticipate utilizing the Moringa tree in Texas.

In a bad year we get down to 12C (54F). Tho usually doesn't go below 14. Winter kills young moringas here. You will need to look after them very carefully for their first winter but once they are mature they will be stronger.

The best N fixer trees in m my frost free experience are gliricidia sepium and leucaena leucocephala. They are miles ahead of mesquite, palo verde etc for rate of growth. I am unsure how they will do below our 12C minimum but they should from what I've read be OK down to just above freezing. These trees recover well form being cut to ground level, so even if you lose the above ground part of the tree I think they will recover. They have to be in well draining soil/sand. Seeds are dirt cheap on eBay. Good luck.

Awesome information! I love when I can utilize others successes, thank you for the wisdom!

The book "How to Grow native plants of Texas and the Southwest" by Jill Nokes discusses propagation of several hundred varieties of trees and shrubs from both seeds and cuttings, and may be a valuable resource for you.