I'm working on a project to build the lowest maintenance vegetable garden possible. Part of the plan is hydroponic (first bank of tanks planted last week), but some things grow better in dirt. What I'm looking for right now is a source for cuttings for Luther Burbank's spineless prickly pear cactus. I understand that there are a number of cultivars, but don't know any details. Very little on the net. Any info will be greatly appreciated.