Hanging tinfoil in the trees around the garden scares away the crows.
The internet was wrong. The crows are still harassing me, and every other living thing within a 5 mile radius. Also, in case you were curious, they don't give a tiny rat's ass about CDs hung in the tress. Even if they are old scratched White Stripes CDs. Crows do not fear Jack White, or his Sister/Wife.
PS. Did you notice the cucumber plants in the background of the first photo? They are now about 6" high, so growing, but you know, not really needing that enormous trellis.