I raised tomatoe plants in the treee sized ones. Some were in the 5 gallon some in the bigger. More root room is nice but they did fine. I also had squash but it didnt seem to care for the 5 gallon pot I had it in.. I think maybe the 15 gal would work better... I had crookneck squash, early girl and beef steak tomotoes...texastami said: