Plants That Repel Moles: An Honest Assessment

Do Mole-Deterrent Plants Protect Your Southern California Lawn?

Several plants are marketed or recommended as natural mole repellents — crown imperial, caper spurge, alliums, and others. The idea is appealing: plant a natural deterrent and moles will avoid your yard. The evidence, however, does not support this strategy as a reliable mole control method.

Why Plant-Based Mole Repellents Are Unlikely to Work

Moles eat earthworms and soil insects — not plants. Unlike gophers, which actively seek out and eat plant roots, moles tunnel through soil in search of invertebrates. Moles have essentially no interest in plants themselves.

A plant whose roots emit an unpleasant chemical might deter a gopher that would otherwise eat those roots. But a mole tunneling in search of earthworms has no reason to avoid a specific plant — it is not trying to eat the roots, it is trying to get to the earthworms on the other side.

This fundamental difference in diet is why plant-based mole deterrents are even less likely to work than plant-based gopher deterrents.

Crown Imperial (Fritillaria imperialis)

Crown imperial is frequently listed as a mole-deterrent plant. The bulbs have a strong foxy odor that some claim deters moles and other burrowing pests.

Evidence: entirely anecdotal. No controlled studies demonstrate that crown imperial reliably deters moles. Some gardeners report reduced mole activity near crown imperial plantings — but this is impossible to separate from natural variation in mole activity.

Crown imperial is also expensive, requires well-drained soil, and performs inconsistently in Southern California's hot summers.

Verdict: insufficient evidence to recommend as a mole deterrent.

Alliums (Ornamental Onions and Garlic)

Alliums are sometimes recommended for mole deterrence based on their pungent scent. No evidence supports this claim for moles. Alliums are a reasonable landscape plant choice but should not be planted specifically to deter moles.

Caper Spurge (Euphorbia lathyris)

The same plant marketed as a gopher deterrent is sometimes also sold as a mole deterrent. Evidence for effectiveness against either pest is inconsistent. Caper spurge is toxic to humans and pets and can be invasive in California.

Verdict: not recommended.

What Actually Works for Mole Control

Professional mole trapping in primary tunnel runs is the only method with consistent evidence of effectiveness. Moles must be trapped in the deep primary runs they use repeatedly — not in surface feeding runs or near mole hills.

Rodent Guys provides professional mole trapping throughout Southern California with a 60-day guarantee. Call 909-599-4711 for same-week service.