Nope, no stakes, they stand up on their own just find. Occasionally a deer will trip over one in the dark and flip it off the tree though, found one 100 yards away. Staking might help that some, but I move the cages in order to mow close to the trees. That is the only draw back I have found (having to move them all), but it really doesnt take very long. I keep my eye out for discarded rolls and every farmer I have asked said "you bet, get it out of here".
I have about 150 so far and in about 10 years or so somebody else can have them if they want to haul them off.