Here is somthing you could plant that might be useful.

Here is a link that might be useful: Euphorbia lathyrus

I was told that gopher purge does not harm them that it is just a plant that they won't eat? I just read in a magazine to put out tiny dishes of Coke - that the rats/mice can't handle the gasses and die. I also just bought some Camphor oil spray that is used to deter gophers and moles from your plants for 2 months. I too line my plant holes with chicken wire and have heard that hardware cloth can be effect but don't know where to find it.

Hardware cloth is at home depot or most building supplys.

After googling a bunch of difficult and expensive solutions to my mole problem, I decided to try something cheap and easy. I took a trowel and cut into a surface tunnel and scraped back some of the dirt. Then I loaded an ordinary mouse trap with peanut butter and laid it facing the section of tunnel toward the source. I put a bucket over it and a rock on top of the bucket to keep out curious pets. Next morning I had my first mole.