Table of Contents
- Introduction
- Identifying the Signs of Garden Visitors
- Small Mammals: The Most Common Bulb Eaters
- Insects That Can Affect Your Corms
- Above-Ground Visitors: Deer, Rabbits, and Groundhogs
- Simple Strategies to Protect Your Garden
- Strategic Planting and Companion Plants
- Managing Thrips for Better Blooms
- Creating a Healthy Garden Environment
- Conclusion
- FAQ
Introduction
Gladiolus are the superstars of the summer garden. Their tall, dramatic spikes and ruffled blooms bring a vertical energy that few other flowers can match. Whether you are growing them for stunning backyard color or as elegant additions to a vase, watching those first green spears break through the soil is a highlight of the season. At Longfield Gardens, we want to help you ensure those beautiful sprouts turn into a spectacular floral show.
Because gladiolus grow from corms—which are essentially concentrated packages of energy and moisture—they can sometimes attract the attention of local wildlife and garden insects. While it might feel a bit discouraging to find a nibbled leaf or a missing bulb, protecting your garden is quite simple once you know who is visiting. This guide covers the most common critters and insects that might take an interest in your gladiolus and offers practical, easy steps to keep your plants safe.
By understanding the habits of these garden visitors and making a few small adjustments to your planting routine, you can enjoy a worry-free growing season. The goal is to work with nature to ensure your garden remains a beautiful and productive space for everyone.
Identifying the Signs of Garden Visitors
Before you can decide on a solution, it helps to identify exactly what is happening in your garden. Different visitors leave different clues. If you notice a problem, take a moment to look at the specific type of damage. This simple step saves time and helps you choose the most effective approach.
Underground Activity
If you planted your corms but nothing ever appeared above ground, or if you see small, round holes in the soil, the visitor is likely working below the surface. Voles, mice, and gophers often tunnel through the garden in search of food. If the soil looks churned up or "fluffy" in a specific spot, a burrower may have been through.
Surface Disturbance
Sometimes you will find the corms themselves sitting on top of the soil, often with a single bite taken out of them. This is the classic signature of a squirrel or chipmunk. These animals are often more interested in the fact that the soil was recently moved than they are in the taste of the bulb itself.
Foliage and Flower Damage
When the plant grows successfully but the leaves or flower buds disappear overnight, the visitor is likely a larger mammal like a deer or rabbit.
- Deer damage: Leaves will have jagged, torn edges because deer do not have upper front teeth. They pull and tear the plant.
- Rabbit damage: Stems are cut at a clean, 45-degree angle. It looks like someone used a pair of garden snips.
Key Takeaway: Identifying the visitor by the tracks or bite marks they leave is the first step toward a successful solution. Most garden challenges are easily solved with one or two simple changes.
Small Mammals: The Most Common Bulb Eaters
Most people who ask "what eats gladiolus bulbs" are dealing with small mammals. These critters are active year-round, and they are always on the lookout for a calorie-rich snack.
Voles and Field Mice
Voles are small rodents that look a bit like mice but with shorter tails and smaller ears. They are perhaps the most common underground bulb eaters. They create tunnels just below the surface or use tunnels left behind by moles. Because they stay underground, you might not realize they are present until you notice a gap in your flower row.
Squirrels and Chipmunks
Squirrels are curious by nature. When you dig a hole to plant your gladiolus, you leave behind the scent of fresh soil. To a squirrel, this looks like another animal has buried a nut or a seed. They often dig up the corm, realize it isn’t what they were looking for, and leave it on the grass.
Gophers
In some regions, pocket gophers can be a challenge. These animals are larger than voles and can move a significant amount of soil. They eat a wide variety of roots and bulbs from below. You will usually know they are present because they leave behind large, crescent-shaped mounds of soil.
Insects That Can Affect Your Corms
While mammals are the primary "eaters," a few tiny insects can also cause damage to gladiolus. These are often harder to see, but their impact shows up in the health of the plant.
Gladiolus Thrips
Thrips are the most significant insect pest for gladiolus. They are tiny, slender insects that are almost impossible to see with the naked eye. While they mostly "eat" by sucking sap from the leaves and flowers, they also overwinter on the corms.
If your flowers look streaked with silver or the buds fail to open, thrips are likely the cause. When they infest the corm in storage, the surface may become rough, brown, and corky. We recommend checking your corms carefully before planting each spring to ensure they are smooth and healthy.
Bulb Mites
Bulb mites are tiny, translucent creatures that thrive in moist conditions. They feed on the base of the corm, which can lead to stunted growth or warped leaves. Healthy soil drainage—which means how fast water leaves the soil—is your best defense against mites. They prefer damp, heavy soil, so keeping your garden beds well-drained keeps the mites away.
Lesser Bulb Fly
The larvae, or maggots, of the lesser bulb fly can sometimes tunnel into gladiolus corms. This usually happens if the corm is already damaged or if the plant is stressed. The larvae eat the internal tissue, making the corm feel soft or spongy.
What to do next:
- Inspect all corms before planting.
- Discard any that feel soft or have visible holes.
- Ensure your planting site has excellent drainage.
- Clean up any old plant debris from the previous year.
Above-Ground Visitors: Deer, Rabbits, and Groundhogs
Once your gladiolus have successfully sprouted, the focus shifts from protecting the bulb to protecting the foliage and the flower spikes.
Deer
Deer generally find the tender, succulent leaves of gladiolus quite tasty. They are most likely to visit in the early morning or late evening. Because gladiolus grow tall, they are at the perfect height for a browsing deer to snack on the flower buds just as they are about to bloom.
Rabbits
Rabbits prefer the young, tender shoots that first emerge in late spring. If you have a resident rabbit, you might find your gladiolus stems "mowed" down to a few inches above the soil line.
Groundhogs
Groundhogs, also known as woodchucks, are voracious eaters. They will eat both the foliage above ground and the corms below. They are capable of eating an entire patch of gladiolus in a single afternoon if they are not discouraged.
Simple Strategies to Protect Your Garden
Protecting your gladiolus doesn't require expensive equipment or complicated chemicals. Most gardeners find success by using a combination of these simple, physical barriers.
Use Hardware Cloth or Chicken Wire
This is the most effective way to stop diggers and burrowers. Hardware cloth is a sturdy wire mesh with small (half-inch) openings.
- For underground protection: Line the bottom and sides of your planting hole with the mesh before adding soil and corms. This creates a "basket" that voles and gophers cannot enter.
- For surface protection: Lay a flat sheet of chicken wire or hardware cloth over the soil after you finish planting. Secure it with garden staples or heavy rocks. The plants will grow right through the holes in the wire, but squirrels won't be able to dig.
Create a "Gritty" Environment
Small mammals have sensitive paws. They generally dislike digging in soil that feels sharp or scratchy. You can mix a handful of coarse gravel or crushed stone into the planting hole. This simple addition makes the area much less attractive to voles and mice.
The Power of Scent
Many gardeners use scent-based repellents to keep deer and rabbits away. These are often made from natural ingredients like garlic, peppermint oil, or putrefied eggs. While these are effective, they do need to be reapplied after heavy rain.
Plant Deeply
Timing and depth are often the quiet winners in the garden. For large gladiolus corms, planting them about 6 to 8 inches deep can put them out of the reach of many surface-level diggers like squirrels. This also provides better physical support for the tall flower spikes as they grow.
Strategic Planting and Companion Plants
One of the easiest ways to protect your favorite flowers is to plant them near things that critters don't like to eat. This creates a natural "no-fly zone" in your garden.
Interplant with Deterrents
Certain plants have very strong scents or tastes that act as natural repellents.
- Alliums: Members of the onion family, including ornamental alliums, have a scent that most rodents and deer avoid.
- Daffodils: These contain a bitter sap that is unpalatable to almost all garden visitors.
- Fritillaria: These unique bulbs have a "skunky" odor that helps keep squirrels and voles at a distance.
Mask the Scent
When you plant your gladiolus, you leave behind the "scent" of the bulb. Cleaning up the papery husks that fall off the corms during planting is a simple way to reduce the attraction. If the area smells like fresh soil and nothing else, animals are less likely to investigate.
Provide a Diversion
If you have a very active squirrel or bird population, providing a dedicated feeding station on the opposite side of the yard can work wonders. If they have an easy supply of sunflower seeds or corn, they are much less likely to work hard at digging up your flower bulbs.
Managing Thrips for Better Blooms
Since thrips are the most common insect to "eat" the life out of a gladiolus plant, managing them is a key part of garden success. You don't need to be an expert to keep them under control.
The Soapy Water Method
If you see the tell-tale silver streaks on your leaves, a simple spray of insecticidal soap can help. These soaps work by breaking down the outer shell of the insect. It is a gentle but effective way to manage the population without harming the broader environment.
Fall Cleanup is Key
Thrips love to hide in the old, dried leaves of the gladiolus at the end of the season. By removing and disposing of the foliage once it has turned yellow or brown in the fall, you remove their winter home. Never put thrip-infested foliage in your compost pile; it is better to bag it and move it out of the garden.
Protecting Stored Corms
If you live in a cold climate and dig up your corms for the winter, storage is the time to be most vigilant.
- Keep them cool: Thrips are less active at temperatures below 50°F.
- Airflow: Store your corms in mesh bags or open crates to ensure they stay dry.
- Dusting: Some gardeners use a light dusting of garden lime or a specialized bulb dust to keep insects away during the dormant months.
Creating a Healthy Garden Environment
At the end of the day, a healthy plant is your best defense against pests. When a plant is growing vigorously in the right conditions, it can often withstand a bit of minor nibbling without any long-term issues.
Right Plant, Right Place
Gladiolus love full sun and well-drained soil. A plant that is struggling in the shade or sitting in soggy soil is much more likely to be targeted by mites or diseases. By giving your "glads" the sun and drainage they crave, you are giving them the best possible start.
Consistent Moisture
While they don't want to be soggy, gladiolus do appreciate consistent water, especially when the flower spikes are forming. Deep watering once or twice a week is much better than a light sprinkle every day. This encourages the roots to grow deep into the soil, making the plant more resilient.
Observe and Enjoy
Gardening is a rewarding activity that connects us to the cycles of nature. Spend a few minutes each week walking through your garden. By noticing changes early, you can take small, easy steps to keep your plants healthy.
Simple Tip: If you notice a plant isn't looking its best, try changing just one thing—like how often you water or adding a small physical barrier—and then wait a week to see how the plant responds. This "one change at a time" approach is the best way to learn what works in your specific yard.
Conclusion
Sharing your garden with nature doesn't have to be a source of stress. By identifying the signs of common visitors like voles, squirrels, and thrips, you can take simple, proactive steps to protect your beautiful gladiolus blooms. Whether you choose to use hardware cloth cages, scent-based repellents, or strategic companion planting, these methods are effective and easy to implement for any skill level.
At Longfield Gardens, we believe that gardening should be a joyful and rewarding experience, and we back our plants with a 100% Quality Guarantee. Getting the basics right—like planting depth, drainage, and basic protection—is all it takes to see incredible results. With a little bit of planning, your garden will be filled with the towering, colorful spikes of gladiolus all summer long.
- Identify the culprit by looking at bite marks and soil disturbance.
- Use physical barriers like hardware cloth for the most reliable protection.
- Practice good sanitation by cleaning up plant debris and husks.
- Interplant with deterrents like daffodils or alliums to mask the scent.
For bigger plantings, browse Spring Planted Bulb Bulk Buys.
If you like to plan by palette, Spring-Planted Bulbs By Color makes it easy to build a coordinated display.
Growing flowers is a journey of discovery. Every season brings new lessons and new beauties to enjoy. Start with these simple steps and watch your gladiolus thrive.
FAQ
Will squirrels eat my gladiolus bulbs if I leave them on the surface?
Squirrels rarely eat the entire bulb, but they are very likely to dig them up and take a "test bite." If you leave corms sitting on the surface, squirrels or chipmunks will likely carry them off out of curiosity. It is always best to plant them at the recommended depth and cover the soil to hide the scent.
Are gladiolus deer-resistant?
Generally, gladiolus are not considered deer-resistant. Deer find the tall, succulent flower spikes and tender leaves quite delicious. If you have a high deer population, using a scent-based repellent or planting your gladiolus behind a fence or among deer-resistant plants like daffodils is a good idea.
Can I stop voles from eating bulbs without using chemicals?
Yes, the most effective way to stop voles is by using a physical barrier like hardware cloth. Creating a small wire basket to hold the corms prevents the voles from reaching them through their underground tunnels. Mixing gravel into the planting hole also makes the soil unpleasant for them to dig in.
How do I know if thrips are eating my gladiolus?
You will see silver or white streaks on the leaves, and the flower petals may look bleached or "rasped." In severe cases, the flower buds will turn brown and fail to open at all. If you see these signs, you can use a gentle insecticidal soap spray to manage the insects and protect the remaining blooms.