Double Deer Fence
Two 4-foot fences 4 feet apart — deer can jump high or far but not both, and can't judge the double line, so they don't try.
2 techniques
Two 4-foot fences 4 feet apart — deer can jump high or far but not both, and can't judge the double line, so they don't try.
Buried clay vessels that water a garden bed slowly from below.