I had googled "seed exchange" and it brought me to this link and a post from a year ago. I would be interested in trading/giving tree seeds to anyone interested. i live in N. TX so it would need to go to persons not too far north probably. Right now I have seed pods from a Mexican Buckeye tree that blooms in the Spring and of course is very drought tolerant. It will withstand a few freezes a year and is a pretty ornamental tree. I also have green seed pods from a Mountain Laurel and (I think) from an Eve's Necklace understory tree. Look them up and if you would like any of these seeds I will mail to you gratis, just send me something back sometime. Don