Our slope guard was designed by an L.A. Arborist to address the cost and hassle of planting trees on slopes and hillsides. Before our slope guards, the way of addressing this issue cost 75% more than it does now.They used to use concrete or redwood guards which could cost upwards of $100 per tree dependent on size. Our cost effective slope guard addresses all of the big problems associated with hillside tree planting, can be used on any size tree and is extremely easy to install