Bag of Golden Acorns

This leather bag seems mundane but looking inside reveals 1d20 Golden Acorns. When one is taken out it can be thrown onto any surface, at which time a 60ft fully mature oak tree sprouts from that surface and takes root there. The oak grows in an instant, it exists and moves, or breaks, any surface under it as if it had grown there  naturally over the course of 30 years.