The plan to save one of the Minnesota's most imperiled species โ the ball cactus โ is a desperate one. There are only a couple thousand left in the state, and many of those are in active granite quarries where they will eventually be dug up and killed. Nobody has tried planting or re-establishing wild populations in Minnesota before now. https://www.startribune.com/minnesota-endangered-species-ball-cactus-arboretum-big-stone-refuge-wildlife/600306961/

