Answer: Gophers will feed on many, many plants. Euphorbia and narcissus bulbs are about the only things they avoid. You can protect your perennials and bulbs by placing small-meshed hardware cloth in the planting hole, wrapped loosely around the roots or bulbs to exclude the critters and keep them from chewing things up.
If the traps you're placing are springing, but not catching the gophers, you may not be setting them quite right. Scissors-type traps are most effective because the animal has to run through the trap in order to set it off. The other types of traps can be avoided, or accidentally set off with falling debris. Invest in one or two scissors-type traps and your success rate should improve considerably.
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