Moles and Voles: Telling Them Apart and Reducing Damage

Moles and voles are often blamed for the same damage, but they are very different animals, and they need different responses. Moles dig tunnels and push up mounds of soil. Voles use tunnels too, but they eat roots, bulbs, and bark, and they leave small, open holes and surface runways. Treating a vole problem as if it were moles, or vice versa, wastes time and rarely fixes the damage.

The first step is therefore identification. Walk the affected area slowly, look at the shape of mounds and holes, and check what has actually been eaten. That evidence, rather than a guess, should decide what you do next.

Moles: signs and habits

A mole is a small, dark, velvety mammal that lives almost entirely underground. It eats earthworms and soil insects, not plant roots. Its presence shows up as volcano-shaped mounds of loose, fine soil, often 10 to 20 centimetres across, with no obvious entrance hole visible from above. The mound is pushed up from below, so the soil looks freshly turned and crumbly.

Mole tunnels come in two kinds. Deep tunnels are used for travel and are rarely visible. Shallow feeding tunnels, used just below the surface, can appear as raised ridges across a lawn, especially after rain softens the soil. If you step on a ridge, it may sink slightly. That ridge is a tunnel roof, not a plant problem.

Moles are active year-round, but damage is often most noticeable in spring and autumn, when soil is moist and easy to dig. A single mole can maintain a large tunnel system, so many mounds do not necessarily mean many moles.

Crucially, moles do not eat lawn grass, bulbs, or vegetables. The damage they cause is indirect: mounds smother grass, ridges make mowing uneven, and tunnels can dry out roots by creating air gaps around them. Young plants near a fresh tunnel may wilt because their roots lose contact with soil, even though nothing has eaten them.

Voles: signs and habits

Voles are small rodents, similar in size to mice, with blunt faces and short tails. Unlike moles, voles do eat plants. They gnaw roots, bulbs, bark at the base of young trees, and stems of vegetables. They also eat seeds and fallen fruit. Damage is therefore direct and can kill a plant outright.

Vole signs are different from mole signs. Instead of volcano mounds, voles leave small, open holes about 3 to 5 centimetres across, often with no mound at all, or only a small pile of soil beside the hole. They also create surface runways: narrow, cleared paths through grass or mulch, about 5 centimetres wide, linking holes to feeding areas. In long grass, these runways look like tiny, trampled trails.

Vole damage is most obvious in winter and early spring. Bark stripped from the base of a young tree in a ring around the trunk is a classic vole sign, especially where snow or mulch has given voles cover up to the trunk. Bulbs that vanish over winter, or carrots and potatoes with gnawed roots, are also typical. In summer, voles may still be active, but damage is harder to spot among fast-growing plants.

Voles breed quickly when food and cover are plentiful, so numbers can rise fast in a garden with dense ground cover, long grass beside beds, and fallen fruit left on the ground. Reducing cover is therefore a central part of vole control, as explained below.

Telling them apart at a glance

Use this quick comparison before you act:

• Mounds: Moles make volcano-shaped mounds with no visible hole. Voles make little or no mound, but leave open holes.
• Tunnels: Mole tunnels may show as raised ridges. Vole runways are surface paths through grass, not raised ridges.
• Plant damage: Moles do not eat plants. Voles eat roots, bulbs, and bark.
• Soil: Mole mounds are fine and crumbly. Vole holes often have grass or mulch pushed aside, not a neat soil cone.
• Timing: Mole activity is visible year-round in moist soil. Vole bark damage often appears after winter.

If you are still unsure, check one mound carefully. A mole mound contains loose soil with no surface opening, while a vole hole is an open entrance you can see into.

Reducing mole damage without harm

Many gardeners tolerate moles, especially in larger gardens, because moles also eat soil pests and their tunnels improve drainage and aeration in compacted soil. If mounds on a lawn are the main problem, the simplest approach is to flatten mounds and repair the grass, rather than trying to remove the animal.

To repair a mound, wait until the soil is dry enough to crumble, then rake the mound flat and spread the soil thinly over the lawn. Reseed any bare patch with a suitable grass seed, water it, and keep foot traffic off it for a few weeks. Mowing over a fresh mound spreads soil across the lawn and can blunt mower blades, so always rake mounds flat before mowing. Regular mowing at a sensible height helps the lawn recover quickly, and a guide to mowing a lawn properly explains height and frequency in more detail.

If mole damage is severe, persistent, and affecting a small, high-value lawn, local professional advice is worth seeking. A professional can confirm identification in person and discuss options that are legal and appropriate in your area. Laws on mole control vary by location.

Reducing vole damage

Vole control is mostly about removing cover and protecting vulnerable plants. Start by mowing grass short around vegetable beds, young trees, and bulb plantings, and by clearing dense ground cover within a metre or two of those plants. Voles avoid open ground where predators can see them, so a clear strip around a bed is a strong deterrent.

Protect young trees with a guard. A mesh or plastic guard around the trunk, buried 3 to 5 centimetres into the soil and extending at least 30 centimetres above ground level, stops voles gnawing bark at the base. Check guards after winter, since voles can gnaw above a guard if snow or mulch piles up against it. Keep mulch pulled back 10 to 15 centimetres from tree trunks for the same reason.

For bulbs, plant in wire mesh baskets or use a layer of sharp grit around bulbs in the planting hole. This does not guarantee protection, but it makes bulbs harder to reach. In vegetable beds, harvest root crops promptly, clear fallen fruit, and do not leave piles of cut vegetation beside beds over winter. Those piles are ideal vole shelter.

A thick, healthy lawn also recovers faster from ridges and runways. Aerating a lawn in the right season relieves compaction, and overseeding thin areas in autumn fills gaps before voles use them as runways.

Common mistakes

• Assuming every mound is a vole problem, or every eaten bulb is mole damage, without checking mounds and holes.
• Mowing over fresh mole mounds, spreading soil and damaging mower blades.
• Piling mulch against tree trunks, giving voles covered access to bark all winter.
• Leaving long grass and dense cover right beside vegetable beds and young trees.
• Using a control method that is illegal or unsafe locally, or that risks pets and non-target wildlife.
• Expecting a single repellent device to solve a mole problem permanently, when the animal may simply move tunnels.
• Ignoring the cause of thin lawn, such as compaction, which makes tunnel damage look worse and recovery slower.

A calm, practical approach

Moles and voles are part of many gardens, and complete exclusion is rarely realistic. The goal is to limit damage to a level you can live with, while keeping the garden safe for other wildlife. Identify the animal first, repair lawn damage promptly, remove cover near vulnerable plants, and protect young trees with guards. Those steps, repeated each season, usually reduce problems far more than a frantic response to the first mound or hole.

If damage is extensive, if a young tree has been ring-barked, or if you are unsure about legal control options, seek local professional advice before taking further action. A short visit from someone who can see the tunnels and damage in person is worth more than several guesses based on photographs alone.