Introduction
Dahlias are the undisputed stars of the late summer garden, offering a spectacular array of colors, shapes, and sizes that few other flowers can match. From the massive blooms of dinnerplate varieties to the intricate petals of pompons, these plants provide endless joy and armfuls of fresh-cut flowers. At Longfield Gardens, we want every gardener to experience the thrill of seeing those first buds open into magnificent displays.
While growing dahlias is a rewarding experience, you may occasionally find that you are sharing your garden with some uninvited guests. If you have noticed plants suddenly wilting or tubers disappearing entirely, you might be wondering: do voles eat dahlia tubers? The short answer is yes, they do. These small rodents have a significant appetite for the starchy, nutrient-rich tubers that dahlias produce.
This guide is designed for home gardeners who want to understand vole behavior and learn practical, effective ways to protect their dahlia collection. We will cover how to identify vole activity, the best physical barriers to use, and simple garden maintenance tips to keep these pests at bay. With a few proactive steps, you can ensure your dahlias thrive and bloom beautifully all season long.
Understanding the Vole: A Tuber’s Toughest Rival
To protect your garden effectively, it helps to understand exactly what you are dealing with. Voles are small, stocky rodents that often look like a cross between a mouse and a hamster. They typically grow to about five to seven inches long and have blunt noses, small ears, and relatively short tails. Unlike many other garden visitors, voles remain active year-round, which means they can be snacking on your dormant tubers even in the middle of winter if you live in a warmer climate where dahlias stay in the ground.
Voles are strict herbivores. Their diet consists of roots, stems, seeds, and—most frustratingly for dahlia lovers—starchy bulbs and tubers. They are particularly fond of the energy-packed tubers of dahlias, which provide them with excellent nutrition throughout the year. Because voles are prolific breeders, a small population can grow quickly if left unchecked. A single female can have several litters a year, meaning a few quiet visitors in the spring can become a much larger family by late summer.
One of the reasons voles are so effective at finding your dahlias is their tunneling habit. They create intricate networks of shallow burrows just below the soil surface. These tunnels allow them to travel safely away from the eyes of predators like hawks and owls while giving them direct access to the root systems of your favorite plants. When a vole finds a dahlia clump, it may eat the entire tuber system, leaving the stems to simply fall over or wither away.
Key Takeaway: Voles are herbivorous rodents that stay active all year and specifically target starchy plant parts like dahlia tubers for food.
Vole vs. Mole: Knowing the Difference
Gardeners often confuse voles with moles, but the two are very different animals with entirely different diets. Distinguishing between them is the first step in successful garden management. If you mistake a mole for a vole, you might spend time and money on solutions that don't address the actual problem.
The Insect-Loving Mole
Moles are carnivores, or more specifically, insectivores. Their diet is almost exclusively made up of earthworms, grubs, and soil-dwelling insects. Moles do not eat plants, roots, or tubers. While their tunneling can occasionally disturb a plant's roots or create unsightly ridges in your lawn, they are actually beneficial in some ways because they eat lawn pests like Japanese beetle grubs. If your dahlia tubers are being eaten, a mole is likely not the culprit, though a vole might use an abandoned mole tunnel to get to your plants.
The Plant-Eating Vole
As we’ve established, voles are the ones with the appetite for your garden. If you see tunnels and your plants are dying or disappearing, you have a vole issue. Another way to tell them apart is by looking at the tunnels themselves. Moles create raised ridges on the surface of the soil or grass as they "swim" through the earth. Voles tend to create clean, open entry holes about the size of a golf ball and "runways" through tall grass or mulch rather than raised ridges.
Signs of Vole Activity
- Vanishing Plants: A healthy dahlia might look fine one day and be completely wilted or tipped over the next. If you pull on the stem and it comes out of the ground with no roots or tubers attached, voles have been at work.
- Spongy Soil: If the ground feels soft and "bouncy" when you walk over your flower beds, it is a sign of a high concentration of tunnels underneath.
- Surface Runways: Look for small, worn paths in the grass or mulch that look like tiny highways connecting one hole to another.
- Nibbled Stems: Voles will sometimes chew on the base of dahlia stems or the bark of young shrubs near the ground.
Protecting Your Dahlias with Physical Barriers
The most reliable way to keep voles away from your dahlia tubers is to use physical barriers. Since voles are excellent diggers but cannot chew through metal, creating a "fortress" for your plants is a very effective strategy. This approach is especially helpful if you know you have a high vole population in your area.
Using Hardware Cloth
Hardware cloth is a type of galvanized steel mesh that is much stronger than chicken wire. For vole protection, you should use a mesh with 1/4-inch or 1/2-inch openings. Anything larger may allow a small vole to squeeze through. You can use this material to create "baskets" for your tubers.
To make a dahlia basket, cut a piece of hardware cloth and fold it into a box or cylinder shape. When you plant your dahlia in the spring, place the basket into the hole first, then place the tuber and soil inside the basket. Make sure the edges of the wire extend an inch or two above the soil surface. This prevents voles from simply "scooting" over the top of the wire to reach the tubers. As the dahlia grows, its smaller feeder roots will grow through the mesh, but the main tuber clump will remain protected inside the steel cage.
Planting in Pots
If you find working with wire mesh difficult, planting your dahlias in plastic pots is a fantastic alternative. This is a favorite trick for many of us at Longfield Gardens because it is simple and serves two purposes. Choose a 2-gallon or 3-gallon nursery pot and cut out the bottom completely. Sink the pot into the ground so the rim is just above the soil level, then plant your tuber inside.
The solid plastic sides of the pot act as a wall that voles cannot easily penetrate. By removing the bottom, you still allow for excellent drainage and deep root growth. At the end of the season, when it is time to lift your dahlias for winter storage, the pot makes the process much easier. You can simply lift the entire pot, and your tubers will be contained neatly inside.
Vole-Proofing Raised Beds
Raised beds are a wonderful way to grow dahlias because they offer superior drainage and soil control. However, voles can easily tunnel up into a raised bed from underneath. If you are building new beds, you have a golden opportunity to vole-proof them from the start.
Before filling your new raised bed with soil, line the entire bottom with hardware cloth. Staple the wire firmly to the wooden frame so there are no gaps. This creates a permanent floor that rodents cannot cross. For existing raised beds that have a vole problem, you may need to dig out the soil and install the wire, or consider using the pot-in-pot method described above for individual plants.
Key Takeaway: Physical barriers like hardware cloth baskets or bottomless plastic pots are the most effective way to prevent voles from reaching dahlia tubers.
Garden Maintenance for Vole Control
While physical barriers provide the best protection, you can also make your garden much less attractive to voles through simple maintenance. These pests thrive in environments where they feel safe from predators, so "cleaning up" their hiding spots can go a long way.
Manage Your Mulch
We often recommend mulch for its ability to retain moisture and suppress weeds. However, in gardens with a heavy vole presence, thick layers of wood chips or straw can be a double-edged sword. Voles love to tunnel under mulch because it hides them from hawks, owls, and cats. If you are struggling with voles, try to keep the mulch layer thin—no more than two inches—and keep it a few inches away from the base of your dahlia stems. This creates a "clear zone" that makes voles feel exposed and vulnerable.
Tidy Up Grass and Debris
Voles love long grass, overgrown weeds, and piles of fallen leaves. These areas provide perfect cover for their surface runways. By keeping your lawn mowed and trimming back tall weeds near your flower beds, you remove their "highway system." Clearing away leaf litter and garden debris in the fall is also crucial. A tidy garden in the winter means fewer places for voles to nest and stay warm near your dormant plants.
Strategic Planting
Interestingly, there are some plants that voles generally avoid. While they love dahlias, lilies, and tulips, they tend to stay away from members of the Allium family (like ornamental onions, garlic, and chives) and Narcissus (daffodils). Integrating these plants into your garden beds can act as a natural deterrent. Planting a border of alliums around your dahlia patch can sometimes discourage voles from entering the area, as they find the scent or taste of these bulbs unappealing.
Bird Feeder Awareness
Many of us enjoy feeding birds, but spilled birdseed is a major attractant for rodents, including voles. If your bird feeder is located right next to your dahlia bed, you are essentially inviting voles to a buffet. Move bird feeders to a neutral area of the yard, or use a "no-mess" seed mix to ensure that there isn't a pile of food on the ground every evening.
Traps and Repellents: Adding Extra Layers of Protection
If you have a high population of voles, you might want to supplement your physical barriers and garden maintenance with traps or repellents. While these methods are rarely a "silver bullet" on their own, they can be helpful as part of a larger strategy.
Using Snap Traps
Common mouse snap traps can be very effective for catching voles. The key to success is placement. Since voles use established runways, you should place the traps directly in their path, perpendicular to the runway. Bait the traps with a small amount of peanut butter mixed with oatmeal or birdseed.
To keep other wildlife and pets safe, always cover the trap. A small wooden box with holes cut in the ends or even a piece of curved PVC pipe can work perfectly. This creates a dark "tunnel" that voles love to enter while preventing a bird or a neighbor’s cat from accidentally triggering the trap. Check traps daily and move them if you haven't caught anything after a few days.
Castor Oil Repellents
There are several commercially available vole repellents that use castor oil as the active ingredient. These come in both liquid and granular forms. The idea is that the castor oil makes the soil and the plants smell and taste unpleasant to the voles. While these can be effective, they are temporary. You will need to reapply them after heavy rains or irrigation. Many gardeners find that castor oil works best as a perimeter treatment to encourage voles to move away from a specific prized bed.
Encouraging Natural Predators
Nature has its own way of balancing pest populations. If you have the space, encouraging predators like owls and hawks can be a great long-term solution. Installing an owl nesting box or providing a high perch for hawks can make your garden a much more dangerous place for a vole. Domestic cats that are good hunters can also be very effective at keeping the vole population in check, though we always recommend keeping a balance with local bird populations.
What to Do Next:
- Inspect your dahlia beds for small holes or "spongy" spots in the soil.
- Construct hardware cloth baskets for any new dahlias you plan to plant.
- Clear away tall grass and excess mulch from the base of your plants.
- Consider planting fragrant daffodils nearby as a natural deterrent.
Storing Dahlias to Avoid Winter Vole Damage
In many parts of the United States, dahlia tubers must be dug up and stored indoors for the winter to protect them from freezing temperatures. This practice is also an excellent way to protect them from hungry voles during the cold months when other food sources are scarce.
If you live in USDA hardiness zones 8 or warmer, you might be tempted to leave your tubers in the ground year-round. However, winter is often when vole damage is most severe. With the garden foliage gone, the tubers represent one of the few high-energy food sources available. If you have a known vole problem, we recommend lifting your tubers even if your zone is technically warm enough for them to overwinter.
Once lifted, store your tubers in a cool, dry, and frost-free location like a basement or crawl space. Even indoors, keep an eye out for mice or voles that might find their way into your storage boxes. Storing tubers in crates with tight-fitting lids or using mesh bags can provide that final layer of security until it is time to plant again in the spring. For timing details by climate, see the Shipping Information page.
Realistic Expectations for Vole Management
Gardening is a partnership with nature, and that means we sometimes have to share our space with local wildlife. While it can be frustrating to lose a plant, it is helpful to remember that vole populations often go through natural cycles of peaks and valleys. Some years you may see no activity at all, while other years may require more vigilance.
At Longfield Gardens, we believe that a few simple precautions can make all the difference. You don't need to eliminate every vole in the neighborhood to have a successful dahlia garden. By focusing on high-quality physical barriers for your most prized varieties and maintaining a tidy garden, you can significantly reduce the risk of damage. Most dahlias are incredibly resilient; if a vole only nips a small part of a large tuber clump, the plant will often continue to grow and bloom without skipping a beat.
Stay observant and be ready to adapt your strategy if you see new signs of activity. A proactive approach in the spring—getting those hardware cloth baskets or pots into the ground—is much easier than trying to fix damage later in the season. With the right site preparation and a bit of care, your dahlias will reward you with a spectacular show of blooms from mid-summer through the first frost. If you’re building out your order, browse our dahlia collections for more options.
Conclusion
Protecting your dahlias from voles doesn't have to be a stressful or complicated process. By understanding that voles are herbivorous neighbors looking for a starchy snack, you can take simple steps to steer them away from your flower beds. Physical barriers like hardware cloth and nursery pots remain the gold standard for protection, ensuring your tubers stay safe while their roots and blooms flourish.
A balanced approach that combines garden hygiene, strategic planting, and physical protection will yield the best results. Gardening is meant to be an enjoyable and rewarding pursuit, and seeing your dahlias reach their full potential is well worth the effort of a little extra site preparation.
- Identification is key: Make sure you are dealing with voles (herbivores) rather than moles (insectivores) before choosing a strategy.
- Barriers work best: Use 1/4-inch hardware cloth baskets or bottomless pots to create a physical wall around your tubers.
- Keep it tidy: Remove heavy cover like tall grass and thick mulch where voles love to hide.
- Stay proactive: Lift and store tubers in the winter if you have high vole activity in your area.
We invite you to explore our wide selection of dahlia tubers and other spring-planted bulbs to find the perfect additions to your garden. Our team at Longfield Gardens is always here to help you grow a more beautiful home landscape with confidence and ease.
FAQ
How do I know if a vole or a mole is in my garden?
The easiest way to tell the difference is by looking at the damage and the tunnels. Moles create raised ridges on the soil surface and eat only insects, so they won't harm your tubers. Voles create small, open holes and surface runways, and they actively eat plant roots and dahlia tubers. If your plants are wilting and the tubers are gone, you have voles.
Can voles climb into raised garden beds?
Yes, voles are capable of climbing or jumping short distances, but they are primarily tunnelers. They are much more likely to enter a raised bed by digging underneath the wooden frame. To prevent this, line the bottom of your raised bed with galvanized hardware cloth before adding soil. If the bed is already established, using bottomless pots for your dahlias can provide a localized barrier.
Will coffee grounds or pepper flakes stop voles from eating dahlias?
While some gardeners find that strong-smelling substances like coffee grounds, crushed red pepper, or garlic powder act as a temporary deterrent, they are generally not a permanent solution. These substances wash away quickly with rain or watering. For reliable protection, physical barriers like wire mesh baskets are much more effective than home remedies.
Is it safe to use poison to get rid of voles?
We generally advise against using poisons in the home garden. Voles are part of the food chain, and a poisoned vole may be eaten by a pet, a hawk, an owl, or a beneficial snake, leading to secondary poisoning of these animals. Using snap traps inside protective covers or installing physical barriers is a much safer and more environmentally friendly way to manage vole populations.
