Voles eating bulbs and roots: how to identify and keep them away

Voles are small burrowing rodents that start tunnelling in autumn and can wipe out your entire tulip collection. Unlike moles, which only dig passages, voles actually eat your bulbs, roots and young plants. The worst part is you only discover the damage in spring when there is nothing left. But there are sensible ways to stop them without poison or animal cruelty.

The good news is you can identify voles, and better still, you can design your garden so they far prefer to stay away. With mesh guards, natural predators and clever plant choices, you are already halfway there.

Identifying voles: not all underground tunnels are made by moles

First and foremost, you must understand that voles are absolutely not the same as moles. This distinction determines how you tackle them. A mole digs invisible, wide passages just below the surface and eats insects daily in those tunnels. A vole digs much smaller, finer passages (3 to 5 centimetres diameter) and eats bulbs and roots it encounters.

Voles leave characteristic traces. Look for small, neat holes about one centimetre across in your grass bed, sometimes with a tiny mound of earth like mole hills, but much smaller and more orderly. When a vole eats through your bulb bed, you often see whole rows of damaged bulbs in spring, as if everything has been systematically eaten. That is exactly what happened.

Another sign is footprints in wet soil or snow. Vole tracks are much smaller than rat prints (about 3 millimetres across), and you sometimes see their characteristic tunnel patterns disappear under the snow. These are their winter highways. If you see these signs now, prevention in October and November is critical.

Why October and November are the crucial months

Voles are relatively scattered and inactive in spring and summer. But when cold arrives, they congregate in protected places and hunt for food close to home. This means your bulbs and roots suddenly become much more interesting. A vole in November will dig straight to your tulip bed unless you protect it.

October is therefore the time to act. You still have plenty of time before voles begin their heaviest tunnelling work. If you let this moment pass and only act in January, it is already too late for many bulbs.

Mesh guards: the most reliable protection for bulbs

The most effective way to protect your bulbs against voles is with mesh guards. These are small, rectangular cages made of wire mesh (approximately 6 millimetres) that you simply place over your bulbs before planting them.

How it works: fill your bed or border with about 5 centimetres of soil. Place your tulips, daffodils, crocuses or other bulbs. Now place the mesh guard over the bulbs and cover again with soil. The vole cannot bite through the mesh, so your bulbs stay safe. Not sure how many guards your bed needs? On gardenworld.app you see a free example of your own garden first, with the bulb bed drawn in.

The advantages are obvious: no poison, no dead animal under your garden, and it actually works. All you need to do is a little extra work when planting. Many gardeners have used mesh guards for years and swear by them. You can buy ready-made guards (about 3 to 5 euros each) or make your own.

Important: also protect young planted plants with mesh when you plant them. A young rose bush planted in October can be eaten by a vole just as easily.

Catnip: the scent that voles prefer to avoid

Beyond physical barriers, catnip (Nepeta cataria) works very effectively as a deterrent plant. Voles hate the smell and avoid areas where catnip grows. This means you can plant catnip along your bulb beds, borders and fruit trees as a kind of underground defence.

It is not toxic, costs little and grows easily. You can sow seed in March or plant seedlings in May. The plant grows to about 60 centimetres and flowers with purple spikes. Bees love it, so you get better pollination too.

Combine catnip with your bulb beds: in October you clear the flowers, but the plant remains and grows again next spring. This creates a natural protective barrier that voles dislike crossing.

Luring predators: hedgehogs, birds of prey and nature at work

Hedgehogs are your best friends against voles. A single hedgehog eats hundreds of insects per night, yes, but also quite a few small rodents. If you attract hedgehogs by creating leaf piles, hedgehog houses and access through your fence, they do the ground work for you.

Birds of prey like buzzards and kestrels also hunt voles. They cannot hunt in your garden if it is densely planted. Open lawns with few hiding places are much better for birds of prey. So dense borders, ground cover, hedges? Good for looks, less good for rodent control. If you want birds of prey, you need open space.

But the best is a combination: open space somewhere for hunters, dense planting elsewhere for hedgehogs. Both create their own ecological control on vole populations, entirely without poison.

Shallow ground cover prevents underground burrowing

A much underrated method is ground cover to prevent vole damage. Voles dislike vigorous root-forming ground covers like sedum and alchemilla. Why? Because their tunnels are constantly interrupted by these dense root networks.

If you plant your ground covers densely (about 30 centimetres apart) as soon as your bulbs go in the ground (October-November), by next spring a substantial network of roots will have formed that discourages voles.

Good ground covers against voles are sedum (stonecrops), Alchemilla mollis (lady's mantle), Geranium (cranesbill) and low-growing perennials like Thymus and Ajuga. They are winter-hardy, bloom beautifully and provide protection at the same time.

Traps: when prevention is not enough

Not all voles can be stopped with prevention alone. If you already see damage, you must set traps actively. This is not pleasant work, but it is effective.

Vole traps are different from mouse traps. They are smaller, more sensitive and specially designed for these rodents. Place them in the tunnels or on the paths where you see vole tracks. Use peanut butter, apple seeds or hazelnuts as bait. Check daily, as a dead vole decays quickly.

This is properly humane and much more targeted than, for example, poison pellets which can also harm birds and other creatures.

Step by step: voles from October to May

Step 1: Identify vole damage now

Look carefully at your bulb bed and grass. Are there small holes or smooth tunnels 3-5 centimetres across? Look for characteristic tracks and cover them with soil; if you see footprints tomorrow, you know you have voles. This helps you decide if you really have a problem.

Step 2: Order and prepare mesh guards

Start with mesh guards. Buy mesh of 6 millimetres or make your own guards. You will need them before you plant bulbs in October. For a standard bulb bed of one square metre you will need about 8 to 12 guards.

Step 3: Plant bulbs in layers with mesh

Lay your first layer of soil in your bed. Place bulbs. Lay mesh. Cover with soil. Repeat for multiple layers of bulbs. The work takes longer, but your bulbs are safe.

Step 4: Plant catnip around the borders

Make sure you have catnip around the edges of your bulb bed, or in pots nearby. This diverts voles from your precious bulbs.

Step 5: Attract hedgehogs and birds of prey

Set out leaf piles, place hedgehog houses and create access through your fence. This invites hedgehogs. Leave some open space for birds of prey.

Step 6: Check in January and February

Deep in winter, as damage becomes visible, set traps if needed. Usually you only see how severe it is in March or April, so prevention is much smarter.

Frequently asked questions about voles and bulb protection

Can voles bite through plastic? No, plastic bag liners stop them. But 6-millimetre mesh is even better because it remains effective even if soil shifts in winter.

My bulbs were eaten last season. Can I take the same risk this year? Absolutely not. This season: mesh guards and catnip. Next season will be much better.

Are voles poisonous to pets if they eat them? No, voles themselves are not toxic. But if you use poison pellets, cats and dogs can be indirectly poisoned. This is another reason to use mesh guards and traps instead of poison.

How many voles can empty one bulb bed in one winter? A single vole eats approximately 15 to 30 grams of food per day. That sounds little, but a bulb is 30 to 50 grams. A vole can therefore eat one to two bulbs per day. With two or three voles in your garden, your entire stock can disappear.

Do paving stones above my bulb bed help? Partly. Stones prevent new voles from burrowing in, but voles already below can escape via side tunnels. Better: stones PLUS mesh guards.

See it in your own garden first

Many gardeners feel helpless against voles because they discover the damage too late. But if you now, in October, lay mesh guards and plant catnip, you will have far less trouble next spring. And that is not only better for your bulb bed, it gives much more pleasure.

Unsure how those protected bulbs look underground? Unsure which ground covers help most? On gardenworld.app you see different options for your garden. Upload a photo of your bulb bed and design a plan with mesh guards, catnip and ground covers that fit perfectly in your garden. The detailed plan with all steps costs 7.99 euros, one time, no subscription. You see the design straight away.