If your marigold blossoms are suddenly full of holes, you likely have some hungry visitors. You are probably wondering what eats marigolds, as these bright flowers are often touted as pest-resistant. The truth is, while marigolds are excellent companion plants, they are not immune to every creature in the garden. This guide will identify the common culprits, explain the damage they cause, and give you practical, step-by-step solutions to protect your plants.
What Eats Marigolds
Many gardeners plant marigolds to repel insects, but several pests and animals still find them appetizing. The list of offenders includes slugs, snails, Japanese beetles, aphids, spider mites, thrips, caterpillars, and even birds and mammals like rabbits and deer. Identifying the correct pest is the first step to effective control, as the treatment for a snail is very different from the treatment for a rabbit.
Common Insect Pests That Target Marigolds
Insects are the most frequent diners on marigold plants. They can chew leaves, suck sap from stems, and devour petals, often leaving distinct signs of their presence.
Slugs and Snails
These are likely the top culprits for marigold damage. They feed at night and on cloudy days, leaving large, irregular holes in leaves and flowers and characteristic silvery slime trails on the soil and foliage. They are especially problematic in damp, shady garden conditions.
- Look for: Ragged holes, slime trails, and damage concentrated on lower leaves.
- Active: Dusk, dawn, and after rain.
Japanese Beetles
These metallic green and copper beetles are voracious eaters. They skeletonize leaves, eating the tissue between the veins so that only a lace-like framework remains. They also chew on flower petals. They tend to appear in mid-summer and feed in groups.
- Look for: Skeletonized leaves, groups of beetles on plants.
- Active: Sunny days, from late June through August.
Aphids
Tiny and pear-shaped, aphids cluster on new growth, stems, and buds. They pierce the plant and suck sap, which can cause leaves to curl, yellow, and stunt growth. They also excrete a sticky substance called honeydew, which can lead to sooty mold.
- Look for: Clusters of small green, black, or orange insects, sticky residue, distorted growth.
Spider Mites
These are nearly microscopic pests that suck chlorophyll from leaves. The first sign is often a stippled or speckled yellow appearance on the foliage. Severe infestations create fine webbing on the undersides of leaves.
- Look for: Yellow stippling, fine silk webbing, leaves that look dusty or dry.
- Active: Hot, dry weather.
Caterpillars
Various caterpillars, like budworms and armyworms, will munch on marigold leaves and buds. They can chew large sections or bore into flower buds before they open.
- Look for: Chewed leaf edges, holes in buds, dark green droppings (frass) on leaves.
Vertebrate Animals That Eat Marigolds
Sometimes the damage is too large for an insect. Birds, rabbits, deer, and even squirrels can be attracted to marigolds, especially when other food sources are scarce.
Rabbits
Rabbits enjoy tender marigold shoots and will neatly clip stems and leaves at a clean, 45-degree angle. They often feed in the early morning or evening.
- Look for: Cleanly cut stems near the ground, missing seedlings entirely.
Deer
While marigolds are not their first choice, deer will eat them, particularly young, succulent plants. Deer feeding results in torn leaves and broken stems, as they lack upper incisors and must rip vegetation.
- Look for: Ragged tears on leaves and stems, hoof prints, damage about 3 feet and higher.
Birds
Birds, especially sparrows, sometimes peck at marigold petals or pull seedlings. They may be seeking moisture or insects within the flower.
- Look for: Pecked petals, uprooted seedlings.
How To Identify The Culprit
Correct identification is crucial. Follow these steps to diagnose the problem.
- Examine the damage. Are the holes large or small? Are leaves skeletonized or just missing? Is the stem cut or torn?
- Check the time of day. Damage overnight points to nocturnal feeders like slugs, snails, or rabbits.
- Look for the pest itself. Inspect the undersides of leaves, along stems, and in the soil at the base of the plant.
- Search for secondary signs like slime trails, droppings, or webbing.
Effective Prevention And Control Methods
Once you know what you’re dealing with, you can choose the right strategy. Always start with the least toxic method.
Organic and Cultural Controls
These methods focus on creating an environment that discourages pests.
- Hand-Picking: For larger pests like Japanese beetles, slugs, and snails, hand-picking in the early morning or evening is very effective. Drop them into soapy water.
- Diatomaceous Earth: Sprinkle food-grade diatomaceous earth around the base of plants. This powder is sharp on a microscopic level and deters soft-bodied insects like slugs and snails. It must be reapplied after rain.
- Beer Traps: Bury a shallow container so the rim is level with the soil and fill it with cheap beer. Slugs and snails are attracted to it, fall in, and drown.
- Strong Water Spray: A blast of water from a hose can dislodge aphids and spider mites from plants.
- Beneficial Insects: Encourage or introduce ladybugs and lacewings, which are natural predators of aphids.
- Companion Planting: While marigolds are companions for many plants, ensure your overall garden layout is diverse to avoid monocultures that attract pests.
Physical Barriers
Barriers are excellent for keeping vertebrate pests away.
- Fencing: A chicken wire fence buried 6 inches deep and standing 2-3 feet high can exclude rabbits. For deer, you need a fence at least 8 feet tall.
- Row Covers: Use lightweight fabric row covers to protect seedlings and young plants from insects and birds.
- Copper Tape: Adhesive copper tape around pots or raised beds creates a small electric charge that deters slugs and snails.
Safe Insecticidal Options
When infestations are severe, you may need to use a targeted treatment.
- Insecticidal Soap: Effective against soft-bodied insects like aphids, spider mites, and thrips. It must contact the pest directly.
- Neem Oil: A natural, multi-purpose oil that disrupts the life cycle of many insects and acts as a fungicide. It’s useful against aphids, mites, and beetles.
- Bacillus Thuringiensis (Bt): A natural bacterial toxin that is specific to caterpillars. It is harmless to humans, pets, and beneficial insects.
Always follow the label instructions carefully for any treatment, even organic ones. Apply in the early morning or late evening to avoid harming pollinating insects like bees.
Step-By-Step Recovery Plan For Damaged Marigolds
If your marigolds are already under attack, don’t panic. Follow these steps to help them recover.
- Identify and Remove the Pest. Use the methods above to confirm and eliminate the primary threat.
- Prune Damaged Foliage. Use clean, sharp scissors to trim away severely damaged leaves and flowers. This helps the plant direct energy to new growth.
- Apply Appropriate Treatment. Choose an organic control or barrier method from the lists above to prevent reinfestation.
- Support Plant Health. Water the marigolds at the base (not overhead) to keep leaves dry and prevent fungal issues. Consider a light application of balanced, water-soluble fertilizer to encourage recovery.
- Monitor Closely. Check your plants every few days for signs of returning pests or new problems.
Common Mistakes To Avoid
When dealing with pests, some well-intentioned actions can make things worse.
- Overwatering: Consistently wet soil attracts slugs, snails, and fungal diseases. Let the soil surface dry between waterings.
- Over-fertilizing: Too much nitrogen can create lush, soft growth that is especially attractive to aphids and other sucking insects.
- Using Broad-Spectrum Pesticides: These can kill beneficial insects that would normally help control pest populations, leading to a worse imbalance.
- Not Cleaning Up Debris: Old leaves and plant debris around the garden provide hiding places for slugs, snails, and insect eggs. Keep the area tidy.
FAQ About Marigold Pests
Are marigolds actually pest resistant?
Yes, but with an important caveat. Marigolds release a compound called alpha-terthienyl from their roots which can help repel certain soil nematodes. Their strong scent also deters some insects. However, they are not resistant to all pests, as listed in this article. Their resistance is more about protecting neighboring plants than being completely immune themselves.
What is eating my marigolds at night?
Nocturnal feeders are the prime suspects. This includes slugs, snails, cutworms, and certain beetles. It also includes animals like rabbits and deer. To find out, go out after dark with a flashlight and inspect your plants. Look for slime trails or the pests themselves.
Do rabbits and deer eat marigolds?
They can, especially if other preferred food is scarce. Rabbits are more likely to eat young marigold seedlings and tender shoots. Deer will typically sample marigolds but often avoid them if there are more palatable options available. However, a hungry deer will eat almost any plant.
What can I spray on my marigolds to keep bugs off?
A weekly spray of a diluted neem oil solution or an insecticidal soap can deter and control a wide range of soft-bodied insects. For a simple homemade deterrent, you can try a spray of water with a few drops of dish soap. Always test any spray on a small part of the plant first to check for damage.
Why are there holes in my marigold leaves?
Holes in marigold leaves are most commonly caused by chewing insects. The size and pattern of the hole gives clues. Large, irregular holes point to slugs or snails. Skeletonized leaves (only veins remaining) indicate Japanese beetles. Small, shot-like holes can be from flea beetles or other small insects.