Look closely at the leaf edges and you’ll likely find the culprit hiding underneath or on the underside. If you have been asking yourself “what is eating my hydrangea leaves” you are not alone, this is one of the most common garden questions we get every summer.
The answer is rarely a single pest. Most of the time, you are dealing with a mix of chewing insects, sap-suckers, and sometimes even larger animals like deer or rabbits. The good news is that you can almost always save your plant once you know who the thief is.
In this guide, we will walk through the most likely suspects, how to spot the damage they cause, and the exact steps to stop them from turning your beautiful blooms into a salad bar.
Common Pests That Chew Hydrangea Leaves
Chewing pests leave ragged holes, missing chunks, or skeletonized leaves. These are the bugs you will often find sitting right on the plant when you go out to inspect it.
Japanese Beetles
Japanese beetles are shiny, metallic green and copper colored. They are about half an inch long and they love hydrangeas more than almost any other shrub. They feed in groups, so you will often see dozens of them on one plant at the same time.
The damage they cause is very distinctive. They eat the soft tissue between the leaf veins, leaving behind a lace-like skeleton. If you see this pattern, you have Japanese beetles. They are most active in the early morning and late evening.
- Hand pick them off into a bucket of soapy water.
- Use a beetle trap placed far away from your hydrangea.
- Apply a systemic insecticide containing imidacloprid in early spring.
Slugs And Snails
Slugs and snails are night feeders. They hide under mulch, rocks, or dense foliage during the day. At night, they crawl up the stems and chew irregular holes in the leaves. The holes are usually smooth-edged and not skeletonized.
You will also notice a shiny, slimy trail on the leaves or on the ground near the plant. This slime is a dead giveaway. Slugs prefer young, tender growth, so the newest leaves at the top of the plant will show the most damage.
- Set out a shallow dish of beer at soil level. They will crawl in and drown.
- Spread diatomaceous earth around the base of the plant.
- Water in the morning so the soil is dry by nightfall.
Leaf Cutter Bees
Leaf cutter bees make perfect, almost circular or oval holes cut out of the leaf edges. The cuts look like someone used a hole punch. Unlike other pests, they do not eat the leaves. They take the pieces to build their nests.
This damage is mostly cosmetic. It rarely harms the plant. If you see these perfect circles, you do not need to panic. The bees are beneficial pollinators, so it is best to leave them alone. The plant will outgrow the damage quickly.
Vine Weevils
Vine weevils are dull black beetles with a snout. The adults feed at night and chew notches out of the leaf edges. The notches are usually U-shaped and appear along the outer margin of the leaf. The grubs live in the soil and eat the roots, which can be more serious.
If you see notched edges but no beetles during the day, check the plant with a flashlight after dark. You will find them feeding. You can also shake the plant over a white sheet to dislodge them.
What Is Eating My Hydrangea Leaves At Night
If you go out in the morning and see damage but no bugs, you are dealing with a night feeder. This is a very common situation. The damage happens while you sleep, and the culprit is usually hiding by the time the sun comes up.
Earwigs
Earwigs are reddish-brown insects with pincers on their rear. They hide in dark, damp places during the day, like under pots or in the mulch. At night they climb up and chew irregular holes in the leaves. They also eat the flower petals, which is often the first sign you notice.
To confirm earwigs, roll up a damp newspaper and place it near the plant. Leave it overnight. In the morning, unroll it over a bucket of soapy water. You will likely find several earwigs hiding inside.
Cutworms
Cutworms are caterpillar larvae that live in the soil. They come out at night and chew through stems at the base, often cutting young plants completely off. On hydrangeas, they may also climb up and chew on lower leaves. They curl up into a C shape when disturbed.
To protect your plant, place a cardboard collar around the base of the stem. Push it an inch into the soil. This stops the cutworm from reaching the stem.
Rabbits And Deer
Rabbits and deer are large culprits. They do not leave small holes. They leave jagged, torn edges on leaves and stems. Deer will eat the entire top of the plant, leaving a flat, cut appearance. Rabbits will nibble lower down, leaving clean cuts at a 45-degree angle.
If you see this type of damage, you need a physical barrier. A fence of at least four feet tall will stop deer. A two-foot fence will stop rabbits. You can also use a repellent spray that contains putrescent egg solids. Reapply it after rain.
Sap Sucking Pests That Cause Leaf Damage
Not all damage is from chewing. Some pests pierce the leaf and suck out the juices. This causes discoloration, stippling, or curling. The leaves may look unhealthy even though there are no holes.
Aphids
Aphids are tiny, soft-bodied insects that cluster on the undersides of leaves and on new growth. They are usually green, but can be black, brown, or pink. They suck sap, which causes the leaves to curl downward and become sticky.
The sticky substance is called honeydew. It attracts ants and can grow black sooty mold. To check for aphids, look at the underside of the newest leaves. You will see clusters of small bugs.
- Blast them off with a strong stream of water.
- Introduce ladybugs, which eat aphids.
- Use insecticidal soap spray every few days.
Spider Mites
Spider mites are not insects, they are arachnids. They are very tiny and hard to see with the naked eye. They cause a stippling effect on the leaves, with tiny yellow or white dots. You may also see fine webbing on the undersides of the leaves.
Spider mites thrive in hot, dry conditions. They are more common in late summer. To check for them, hold a white piece of paper under a leaf and tap it. If you see tiny moving specks, you have mites.
Increase humidity around the plant by misting the leaves. Use a miticide if the infestation is severe. Neem oil also works well.
Scale Insects
Scale insects look like small brown or white bumps on the stems and leaf undersides. They do not move much. They suck sap and excrete honeydew, which leads to sooty mold. The leaves may turn yellow and drop early.
Scale is harder to treat because the shell protects them from contact sprays. Use a horticultural oil spray in the dormant season. You can also rub them off with a cotton swab dipped in rubbing alcohol.
How To Identify The Culprit By The Damage Pattern
You do not need to be an entomologist to figure out the pest. The damage pattern is often enough. Here is a quick reference guide to help you match the symptom to the suspect.
Holes In The Middle Of The Leaf
If the holes are in the middle but the edges are intact, you are likely dealing with slugs or snails. They eat from the inside out. Check for slime trails to confirm.
Skeletonized Leaves
If the leaf looks like lace, with only the veins remaining, it is Japanese beetles. They are the only common pest that eats this way on hydrangeas.
Notches On The Edges
If the edges look like someone took a bite out of them, with clean U-shaped cuts, it is vine weevils. If the cuts are ragged and torn, it is likely deer or rabbits.
Perfect Circles Cut Out
If you see neat, round holes that look like a paper punch, it is leaf cutter bees. This is harmless and you should not treat for it.
Curled And Sticky Leaves
If the leaves are curling down and feel sticky, it is aphids. Turn the leaf over and you will see the cluster.
Yellow Speckles And Webbing
If the leaf has a dusty, speckled look and you see fine webs, it is spider mites. This is common in hot, dry weather.
Natural And Chemical Control Methods
Once you have identified the pest, you can choose a control method. Start with the least toxic option first. This protects beneficial insects like bees and butterflies.
Physical Removal
For large pests like beetles and caterpillars, hand picking is very effective. Do this in the early morning when they are slow. Drop them into a bucket of soapy water. This works for Japanese beetles, vine weevils, and earwigs.
Water Sprays
A strong jet of water dislodges aphids and spider mites. Do this in the morning so the leaves dry out by evening. Repeat every few days until the population is gone. This method does not kill the pests, it just knocks them off. They may crawl back, so consistency is key.
Insecticidal Soap
Insecticidal soap works on soft-bodied insects like aphids, mites, and young scale. It suffocates them on contact. Spray the undersides of the leaves thoroughly. Reapply after rain. Do not spray in the heat of the day, as it can burn the leaves.
Neem Oil
Neem oil is a natural pesticide that disrupts the life cycle of many insects. It works on aphids, mites, and beetles. It also has some fungicidal properties. Mix according to the label and spray in the evening. Neem oil is safe for bees once it dries.
Chemical Insecticides
If natural methods fail, you can use a chemical insecticide. Look for products containing permethrin or carbaryl for chewing insects. For systemic control, imidacloprid is effective. Always follow the label instructions. Apply in the evening to avoid harming pollinators.
Preventing Future Damage
Prevention is always better than treatment. A healthy hydrangea is more resistant to pests. Here are some steps to keep your plant strong and less appealing to bugs.
Proper Watering
Water at the base of the plant, not overhead. Wet leaves attract fungal diseases and make the plant more susceptible to pests. Water deeply once or twice a week rather than a little every day. This encourages deep root growth.
Clean Up Debris
Remove fallen leaves and dead plant material from around the base. This removes hiding places for slugs, earwigs, and cutworms. Keep the area under the plant clear and tidy.
Inspect Regularly
Check your hydrangea every few days. Look at the undersides of the leaves. Early detection makes treatment much easier. Catching a few aphids is much simpler than dealing with a full infestation.
Encourage Beneficial Insects
Plant flowers that attract ladybugs, lacewings, and parasitic wasps. These insects eat aphids and other pests. Dill, fennel, and yarrow are good choices. Avoid broad-spectrum insecticides that kill these helpful bugs.
When To Prune Damaged Leaves
You may be tempted to cut off all the damaged leaves. This is not always the best idea. The leaves are still photosynthesizing, even with holes. Removing them stresses the plant more.
Only remove leaves that are completely dead or severely diseased. If the leaf is mostly intact, leave it. The plant will recover and produce new growth. You can trim off the worst looking leaves for aesthetics, but do not go overboard.
If the plant has been completely defoliated, do not panic. Hydrangeas are resilient. They will often push out new leaves within a few weeks. Continue to water and feed the plant to support regrowth.
Frequently Asked Questions
Will Hydrangea Leaves Grow Back After Being Eaten?
Yes, they will. Hydrangeas are vigorous growers. As long as the roots are healthy and the plant is not under stress, new leaves will appear. It may take a few weeks, but the plant will recover.
What Is A Natural Way To Keep Bugs Off Hydrangeas?
Neem oil and insecticidal soap are effective natural options. You can also use a homemade spray of water and a few drops of dish soap. Diatomaceous earth works well for crawling insects like slugs and earwigs.
Do Coffee Grounds Keep Pests Away From Hydrangeas?
Coffee grounds can deter slugs and snails. They are abrasive and the caffeine is toxic to them. Sprinkle used grounds around the base of the plant. However, they do not work on beetles or aphids.
Why Are My Hydrangea Leaves Turning Brown And Crispy?
Brown, crispy edges are usually a watering issue, not a pest issue. It could be too much sun or not enough water. Pests rarely cause this type of damage. Check the soil moisture first.
Should I Spray My Hydrangea With Soapy Water?
Yes, a mild solution of dish soap and water can control aphids and mites. Use about one teaspoon of soap per quart of water. Test it on a small area first. Spray in the evening to avoid leaf burn.
Final Thoughts On Protecting Your Hydrangea
Finding out what is eating your hydrangea leaves is the first step to solving the problem. Most of the time, the damage is not fatal. Your plant will survive and bounce back with a little help from you.
Start with the least toxic method. Hand pick the big bugs, wash off the small ones, and use barriers for the four-legged pests. Be consistent and check your plant regularly. A little effort goes a long way in keeping your hydrangea healthy and beautiful all season long.
Remember that a few holes are normal and part of a healthy garden ecosystem. You do not need a perfect plant. Focus on keeping it vigorous and it will reward you with stunning blooms year after year.