If you finely chop citrus rinds and sprinkle them on the mulch in your garden, they keep neighborhood cats, dogs and other critters away from your veggies. Animals don't like the smell of the orange oil.
Make Your Own Greenhouse, I have done this with really good luck. I used an RV door instead of making one and also would use a heat lamp or two for really cold nights. I kept citrus trees in it and it was so nice to go in and set and smell the blossoms and to pick fresh kumquats and oranges and eat.