Battling Buckthorn Wisconsin gardening comes with many obstacles: rabbits, deer, cold winters, and invasive non-native plant species. In the war against invasive plants, one of the worst enemies is Buckthorn, specifically Rhamnus cathartica (Common Buckthorn) and Rhamnus frangula (Glossy Buckthorn). Many times I\’ll be at a customer\’s site and they […]