This is how to make a vertical garden design for planting a tower of herbs or flowers at home. It is a great space utilization idea. The idea is pretty simple and flexible. You just stack some pots together to make a tower. You can modify the idea to fit.
Cut the bottom off a plastic pot to contain invasive plants & bury in the ground. use a larger pot so that the plant can spread it's roots and grow deeper roots, but keeps other tree roots from choking out the one planted.