What I would think is you could use heavy gauge wire shaped into a U shape much like the landscaper use for holding down the black fabric but these would have to be long so they anchor in the ground. Hmmmm, I think I found a solution for the tomato cages this year. Turn them upside down and then wire anchor them into the soil so the wind can't blow them over...I hope. Last year we had to tie rope around the cages to keep them from falling over.
Karen: The garden pics are beautiful. Hopefully the hoops come quickly as the peonies are getting quite tall already.