Fun tree for variety and early season acorns, but they are mostly just a novelty for me. I have over a dozen DCO trees and they will never produce enough mast to be a significant food source
I have a very rocky spot picked out for them if they will tolerate cold. There's no cactus in Ontario though. A few websites have them listed for zone 4, but they might be lying. I'd love to know if anyone has them growing in zone 4, then I will plant at leat 25 of them immediately.