Finally I was able to beat the battle against rodents eating my spinach! I live in San Francisco, where it's mostly foggy and windy. This has been a trail and error for about four years.
Here is what I did:
Purchased three rectangle fabric growing containers
Purchased green shade cloth
Purchased about 16 garden clips
Planted spinach from seed with rich fertilized soil
After a couple of months, wa-la!
Take that you rats!