Have heard of placing the ribbed PVC into half (or partial) cement blocks and pour cement into the hole. The ribs will hold it TIGHT and to help it stand up as you add "limbs' put a plastic container with the cap screwed on VERY tightly between a couple of "branches'; the newer 1 liter pop bottles should work. DO keep in mind, to work, that cap needs to be CRANKED down TIGHT; also below 25? fow the water pressure will simply crush the container.