Try planting "Incarvillea", the tuberous roots give of a pungent smell which moles detest. Not noticable above ground!!Incarvillea is a genus of 16 species of flowering plants in the family Bignoniaceae, native to central and eastern Asia, with most of the species growing at high altitudes in the Himalaya and Tibet. The most familiar species is Incarvillea delavayi, a garden plant commonly known as "hardy gloxinia" or "Chinese trumpet flower". Unlike most other members of Bignoniaceae, which are usually trees or lianas, species of Incarvillea are stemless perennial herbs with fleshy tuberous roots