If you built a huge, netted enclosure over your garden, could you keep these fellows in there free range for pest control?
I would think if you covered your garden with fence and a net they would stay in the pen/garden.. I am not sure how many plants would be alive after a couple weeks.. When they finished killing the bugs they would turn to destroying the garden. I have a 50x50 pen I keep guineas in during breeding season, When I first put them in (about a dozen) it took about 3 weeks until I have dead barren ground where there use to be sod and weeds.