Answer: If the area is small, you might be able to discourage them by placing a barrier around the perimeter of the garden by burying hardware cloth. Hardware cloth is a metal sheet with holes - like a mesh - and will allow water to move through the soil without problem but will effectively keep the pests from tunneling through the soil into the flower bed. Aside from barriers and/or trapping, it's hard to eliminate moles.
Wish I had more suggestions!
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