Where I live their are too many hunters to try an aireal garden. all squirrel hunters scan the canopy, sounds too conspicous to me- creating chemical barriers for deer can be easy- there are many ways without tainting your garden soil, I have found human hair to be an excellant mammal repelant- I go to my barber collect all the hair he has put into panty hose and distribute around my garden- have not had deer in my plants for 25 years now