Introduction
Watching the first green shoots of a dahlia emerge from the soil is one of the most rewarding moments for any gardener. We spend all spring dreaming of those massive dinnerplate dahlias and vibrant colors, so it can be a bit of a mystery when a plant suddenly disappears or never sprouts at all. While most garden visitors are harmless, a few specific animals find the starchy, moisture-rich tubers of a dahlia quite delicious.
In this guide, we will help you identify which animals are most likely to snack on your dahlias and how to protect your garden so you can enjoy a full season of flowers. At Longfield Gardens, we want every gardener to feel confident in their backyard, and that starts with understanding the local wildlife. Whether you are a beginner or a seasoned pro, learning these simple protection strategies will keep your garden thriving.
Identifying the right culprit is the first step toward securing your dahlias and ensuring a spectacular summer display. If you are planning a container setup, you may also want to read our guide to growing dahlias in containers.
The Primary Underground Culprits
When a dahlia tuber goes missing from beneath the soil, the suspect is almost always a burrowing rodent. These animals live and forage underground, making them difficult to spot until the damage is already done. Understanding their habits is the best way to stay one step ahead. For more general growing help, you can also visit Learn with Longfield.
Voles (The Meadow Mouse)
Voles are perhaps the most common reason for missing dahlia tubers. Often called meadow mice, they are small, stout rodents with short tails and small ears. Unlike moles, which primarily eat earthworms and grubs, voles are herbivores. They love the starch and moisture found in flower bulbs and tubers.
Voles are opportunistic. They often use the existing tunnels created by moles to navigate the garden. If you see a dahlia plant suddenly wilt or if you can pull it straight out of the ground only to find the tuber is gone, voles are the likely cause. They tend to nibble the entire tuber or eat the "neck" where the eyes are located, which prevents the plant from ever growing.
Pocket Gophers
If you live in an area with pocket gophers, you likely already know they can be a challenge. These rodents are larger than voles and are highly efficient "underground architects." They create fan-shaped mounds of soil on the surface and can pull an entire dahlia plant down into their tunnel system from below.
Gophers have large cheek pouches (hence the name "pocket") that they use to carry food back to their burrows. A single gopher can clear out a row of dahlias in a very short time. They are particularly attracted to the large, fleshy tubers of dahlias, which provide a significant source of food for them.
Rats and Mice
While less common in some residential gardens, standard field mice and rats will also eat dahlia tubers if other food sources are scarce. This often happens in late autumn if tubers are left in the ground too long or in early spring when the ground is just warming up. Mice tend to gnaw on the edges of the tubers, while rats may eat larger portions.
Key Takeaway: If your dahlia disappears from the bottom up, or if you find empty holes where you recently planted, you are likely dealing with voles or gophers.
Animals That Dig but Don't Always Eat
Sometimes the damage to a dahlia tuber isn't caused by an animal looking for a meal. Several common garden visitors dig around dahlias for other reasons, which can leave your tubers exposed to the elements or physically damaged.
Squirrels and Chipmunks
Squirrels are famous for their curiosity. They don't typically seek out dahlia tubers as a primary food source, but they are notorious for "investigative digging." If you have recently amended your soil with bone meal or other fragrant organic fertilizers, squirrels may dig up the tuber thinking they’ve found a buried nut or a stash of food.
Once a squirrel digs up a tuber, it may take a "test bite" and realize it isn't what they were looking for. They often leave the tuber sitting on top of the soil. While the squirrel didn't eat it, the tuber is now at risk of drying out in the sun or being nibbled by other animals.
Raccoons and Skunks
Raccoons and skunks are rarely interested in the tubers themselves. However, they are very interested in the grubs and insects that live in well-watered garden soil. If these animals are digging in your dahlia bed, they are likely hunting for a protein-rich snack. In the process, they can easily uproot and shred dahlia tubers with their sharp claws. If you see shallow, "conical" holes in the mulch or soil, you likely have a skunk or raccoon visiting at night.
The "Missing Shoot" Mystery
It is very common for gardeners to believe an animal has eaten their dahlia tuber when, in reality, the tuber is perfectly fine underground. The confusion happens when the young, tender shoots are eaten the moment they break the surface. If you don't see the shoot, it looks like the tuber never grew.
Slugs and Snails
Slugs and snails are the most frequent "silent" visitors in the dahlia garden. They love the succulent, watery stems of newly sprouted dahlias. They often eat the shoot right at the soil line during the night. By the time you wake up, there is no sign of the plant.
To tell if a slug is the culprit, look for a silvery slime trail on the soil or nearby leaves. If the tuber is still firm and attached to the ground when you gently brush away the soil, the tuber is safe, but the sprouts need protection.
Rabbits and Deer
Rabbits and deer generally prefer the foliage and flower buds of dahlias over the tubers. However, in the early spring, a rabbit may nibble a sprout down to the ground. This can mimic the appearance of a missing tuber.
Deer are less likely to eat the tubers because they are deep in the soil, but they are famous for "sampling" dahlia plants. If the top of your dahlia looks like it was cleanly snipped off with scissors, a rabbit was likely there. If the stems look ragged or torn, it was probably a deer.
What to do if you suspect digging animals:
- Check the soil for tunnels or "runways" (flattened grass paths on the surface).
- Gently feel under the soil to see if the tuber is still there.
- Look for the shape of the mounds (fan-shaped for gophers, circular for moles).
- Look for "investigative" holes that don't lead to tunnels (squirrels).
How to Protect Your Dahlia Tubers
Once you know which animal is interested in your garden, you can take steps to protect your plants. Prevention is always easier than trying to stop a problem once it has started.
Using Wire Baskets (Gopher Cages)
The most effective way to protect dahlia tubers from voles and gophers is to plant them in wire baskets. You can purchase pre-made "gopher cages" or make your own using half-inch hardware cloth (a heavy-duty wire mesh).
To use this method, dig a hole larger than the tuber. Place the wire basket into the hole, then fill the bottom with a bit of soil. Place your dahlia tuber inside the basket at the correct depth and fill the rest with soil. The wire prevents rodents from reaching the tuber, but the roots and stems can grow freely through the mesh. Ensure the top of the basket sticks up about an inch above the soil line to prevent voles from "hopping" over the edge.
Hardware Cloth Barriers
If you have a dedicated dahlia bed, you can line the entire bottom and sides of the bed with hardware cloth. This is a bigger project but offers long-term protection. This is particularly helpful for raised beds. Simply attach the wire mesh to the bottom of the frame before adding your soil.
Planting in Containers
If you have a severe vole or gopher problem, planting your dahlias in large pots or containers is a great solution. This physically removes the tubers from the underground "highways" where rodents travel. Dahlias grow beautifully in containers, provided the pots are large enough (at least 5-7 gallons) and have excellent drainage.
"Drainage" simply refers to how quickly water can move through the soil and out the bottom of the pot. Dahlias love water but don't like to sit in "wet feet," so ensure your pots have plenty of holes. For more potting advice, see Can Dahlias Grow in Pots?
Natural Repellents
While not as foolproof as physical barriers, certain scents can discourage animals from digging. Castor oil is a popular natural repellent for burrowing animals. You can find castor oil granules or liquid sprays at most garden centers. The scent is unpleasant to gophers and voles, often encouraging them to move to a different area.
Some gardeners also find success by placing crushed oyster shells or sharp gravel in the planting hole. The sharp edges are uncomfortable for rodents to dig through, which may protect the tuber.
Key Takeaway: Physical barriers like wire baskets are the most reliable way to keep underground animals from eating your dahlia tubers.
Simple Steps for Success
At our trial gardens, we’ve found that the best way to keep plants healthy is to focus on the basics. A healthy, vigorous plant is much better at recovering from minor nibbles or garden visitors.
Right Plant, Right Place
Dahlias need at least six to eight hours of full sun to grow strong stems. A plant grown in the shade will be "leggy" and weak, making it more susceptible to damage from pests and animals. Choose a spot with well-draining soil so the tubers stay healthy and firm.
Timing is Everything
Wait until the soil has warmed up and all danger of frost has passed before planting your tubers. In most regions, this is the same time you would plant tomatoes. If you plant too early in cold, wet soil, the tuber may rot before it even has a chance to sprout. A rotting tuber releases scents that can actually attract scavengers like raccoons. For more on timing, read When and Where to Plant Dahlias.
Proper Depth and Spacing
Plant your dahlia tubers about 4 to 6 inches deep. Planting at the correct depth protects the tuber from surface-dwelling animals like squirrels. Space your dahlias about 18 to 24 inches apart to allow for good air circulation, which helps keep the foliage dry and less attractive to slugs and snails. If you want a broader overview, the dahlia planting guide is a good place to start.
Water Correctly
When you first plant your dahlia tubers, you don't need to water them until you see the first green shoots emerge. The tuber has enough stored energy and moisture to get started. Overwatering early on can lead to rot. Once the plant is established, water deeply a few times a week rather than giving it a light sprinkle every day. This encourages the roots to grow deep into the soil, making the plant more resilient.
Troubleshooting Missing Tubers
If you find yourself standing over an empty spot in the garden where a dahlia should be, follow these steps to figure out what happened.
- Search the immediate area: If a squirrel or raccoon dug it up, the tuber might be laying nearby under some mulch or leaves.
- Check for tunnels: Use a stick to gently poke the soil around the planting hole. If the stick sinks in easily, you’ve found a vole or gopher tunnel.
- Inspect the "Neck": If you find the tuber but the top part (the neck where the sprout comes out) is chewed off, voles are the prime suspect.
- Look for Rot: If you find the tuber and it is soft, mushy, or smells bad, it wasn't eaten—it rotted. This is usually caused by soil that stays too wet or planting too early in the season.
If your tuber is gone, don't be discouraged! Gardening is a learning process, and every challenge teaches us how to be better caretakers of our backyard. You can always plant a new variety and use a wire basket for protection the next time around. To see the full range of options, browse our dahlia tubers.
Key Takeaway: Not all missing dahlias are "eaten." Always check for soil tunnels or signs of rot to identify the true cause before changing your strategy.
Creating a Wildlife-Friendly Balance
While it can be frustrating to lose a plant to an animal, remember that your garden is part of a larger ecosystem. Many animals that we consider "pests" also play a role in the environment. For example, birds that visit your garden to look for water might also eat the grasshoppers and beetles that would otherwise munch on your dahlia leaves.
Instead of trying to eliminate all wildlife, focus on making your favorite plants harder to reach. Using barriers like wire cages allows you to enjoy your dahlias while letting the local wildlife pass through the garden without causing damage. Gardening is much more enjoyable when it feels like a partnership with nature rather than a struggle against it.
Conclusion
Protecting your dahlias from hungry animals doesn't have to be a stressful chore. By identifying whether you are dealing with an underground burrower like a vole or a surface-level digger like a squirrel, you can choose the right tool for the job. Simple solutions like wire baskets, planting in containers, and proper timing are often all you need to ensure a season of beautiful, healthy blooms.
At Longfield Gardens, we believe that every gardener can find success by getting the basics right. We are here to support you with quality plants and practical advice every step of the way. With a little bit of preparation and the right protection, your dahlias will be the star of your summer garden. If you want to learn more about our company, visit About Us or check our 100% Quality Guarantee.
- Identify the culprit by checking for tunnels or surface mounds.
- Use wire baskets to protect tubers from voles and gophers.
- Wait for warm soil before planting to prevent rot and attraction of scavengers.
- Consider containers if underground pests are a recurring issue.
"The secret to a successful dahlia garden isn't about having no pests; it's about having the right protections in place so your plants can thrive anyway."
Ready to start your dahlia journey? Explore our dahlias and find the perfect varieties for your garden this season.
FAQ
Do squirrels eat dahlia tubers?
Squirrels do not typically eat dahlia tubers, but they are very likely to dig them up. They are often attracted to the smell of organic fertilizers like bone meal or are simply curious about the freshly disturbed soil. If they dig one up, they might take a small bite and leave the rest of the tuber on the surface. If you need help choosing a place to plant, see our shipping information.
How do I stop voles from eating my dahlia tubers?
The most effective way to stop voles is to plant your tubers in wire baskets made of half-inch hardware cloth. This physical barrier prevents the voles from reaching the tuber while allowing the roots to grow. You can also use castor oil-based repellents to encourage voles to move away from your flower beds. For more growing advice, start with How-To.
Why did my dahlia disappear overnight?
If a plant disappears overnight, the cause depends on what is missing. If the entire plant is gone, including the tuber, a gopher may have pulled it underground. If only the green shoot is gone, it was likely eaten by a rabbit, deer, or a large population of slugs. If you have questions about orders or plants, Contact Us.
Are dahlia tubers toxic to animals?
Dahlia tubers are considered toxic to dogs, cats, and horses if ingested, and the sap can cause skin irritation in some animals. If you have pets that like to dig, it is best to keep your dahlia beds fenced off or use containers to keep the tubers out of reach. Always monitor your pets in the garden to ensure they aren't snacking on your plants. For regional planting timing, consult the USDA Plant Hardiness Zone Map.
