Plant Problem Diagnostic
Groundhog (Woodchuck) and Gopher Damage in the Garden
The short answer
A groundhog (woodchuck) leaves a large burrow entrance, often with a fan of excavated soil, near a deck, shed, or brushy edge, and eats vegetables and flowers down to stubs, sometimes flattening whole rows in a day. Pocket gophers, mostly a western and plains problem, work underground and leave crescent- or fan-shaped mounds of fresh soil with the hole plugged, pulling plants down by the roots rather than grazing openly.
For groundhogs, the reliable fix is a fence built against both digging and climbing: 3 to 4 feet of fence above ground, the bottom buried about 12 inches with the buried portion bent outward in an L about 12 inches away from the garden so digging hits wire, and the top 12 to 15 inches left loose or bent outward so the animal cannot pull itself over. For gophers, exclusion means underground hardware-cloth or wire baskets around beds and root zones. Repellents have little proven effect on either animal.
Which digger do you have?
- Groundhog: burrow openings roughly grapefruit-sized or larger with a dirt apron, well-worn paths, daytime sightings, plants grazed to nubs.
- Pocket gopher: no open hole, crescent/fan-shaped fresh mounds, plants wilting or disappearing downward, damage mostly underground.
- Mole: raised ridges and round mounds, no plants eaten (insect diet).
- Vole: narrow surface runways in grass and gnawed bark, no large mounds.
The groundhog fence, step by step
- 1Height — Use welded or woven wire at least 3 to 4 feet above ground.
- 2Buried L-footer — Bury the bottom about 12 inches and bend it outward at roughly 90 degrees so about 12 inches of mesh lies flat, pointing away from the garden. A digging groundhog hits wire and gives up.
- 3Floppy top — Leave the top 12 to 15 inches unattached to the posts and angled outward; a wobbly top defeats climbing. A single electrified strand near the top, installed per manufacturer instructions, adds insurance.
- 4Close the gates — Gaps under gates are the most common failure point; sill the gate opening with buried wire too.
Gopher exclusion for beds
Line the bottom and lower sides of raised beds with galvanized hardware cloth, and plant vulnerable young trees or prized perennials inside wire gopher baskets so roots are protected while the plant establishes. Fencing above ground does little for gophers since they travel below.
Habitat and harassment
Remove brush piles, tall weeds, and lumber stacks that shelter burrows, and harvest vegetables promptly. Evicting a groundhog by loosely filling the burrow, clearing cover, and disturbing the entrance sometimes convinces it to move, but a good food supply usually wins; expect exclusion to do the real work. Repellents and frightening devices have poor track records for both species.
⚠ Never attempt to gas, flood, or poison burrows near buildings, and note that fumigants and lethal controls for groundhogs and gophers are regulated; check local wildlife regulations before considering them.
When to call a professional
A groundhog denning under a foundation, or gopher damage across a large area, is a job for a licensed nuisance wildlife control operator. Many states restrict relocating trapped animals, so professional handling also keeps you on the right side of the law.
Sources
Reviewed 2026-07-18. We cite university Extension, government, and established horticultural sources — and never invent pesticide rates or dangerous treatments.
- Connecticut DEEP - Woodchuck Nuisance Problems — Woodchuck-proof fencing should be buried about a foot deep with the underground portion bent outward, and the top bent outward or left floppy to prevent climbing.
- Ask Extension - Fencing to keep out woodchucks — Extend fence 3 to 4 feet above ground, bury 12 inches with a 12-inch outward L, and bend the top outward so woodchucks cannot dig under or climb over.
- Nebraska Extension Backyard Farmer - Woodchucks — Woodchucks feed heavily on garden vegetables and burrow near cover; exclusion and habitat modification are first-line controls.