Do Your Hostas Have Holes? Here's What's Going on and How to Stop It
Hostas are one of the most popular shade garden plants thanks to their low-maintenance needs and large leafy foliage, but they're also prone to attracting garden pests and diseases. If you've stepped outside and noticed your hostas suddenly covered in holes, slugs are usually the main culprit. However, several other pests and even fungal diseases can cause similar damage.
The good news? "If you know what to look for, you won't have a hard time with slugs," says Tammy Sons, founder and CEO of TN Nursery. "The damage they cause is easy to identify."
Here's how to determine what's damaging your hostas, as well as simple strategies to protect your plants from slugs and prevent future problems.
Slugs and Snails Are the Most Likely Culprit
"Slugs almost always leave clues if they're the ones doing the damage," says Kyle Turner, president and CEO of Pro Active Pest Control.
The first thing to look for is irregular holes in the leaves.
"Slugs don't create neat, perfectly round holes," he explains. "The damage usually looks ragged and uneven, almost like parts of the leaf were scraped away."
Another giveaway is slime trails.
Slugs leave behind a shiny, silvery trail on leaves, mulch, garden edging or even nearby walkways. Damage is usually most severe during warm, humid periods because those conditions help slugs stay moist and active. They also mainly feed at night.
"If you see those trails in the morning, that's one of the clearest signs they're active in the area," he says.
Young hosta leaves are especially vulnerable because they're softer and easier for slugs to chew through. In the case of severe infestations, slugs can quickly turn large healthy leaves into ragged foliage filled with holes.
Earwigs and Beetles Can Also Chew Leaves
Homeowners shouldn't assume every hole in a hosta leaf comes from slugs.
"Beetles, who also love hostas, leave round holes in the leaves," says Lindsey Chastain, founder of The Waddle and Cluck gardening blog. "Slugs are messier eaters and leave jagged holes."
Japanese beetles are another common offender during summer months. These metallic green pests eat the tissue between veins, leaving a skeletonized appearance behind. Earwigs can also feed on hostas at night, especially in damp garden beds with lots of mulch or debris.
Unlike slugs, beetles are most visible during the day. If you notice insects actively feeding on leaves in sunlight, slugs are less likely to be the main issue.
Fungal Diseases May Cause Small Holes
Not every hole in a hosta leaf is caused by insects. Some fungal diseases can also create spots that eventually dry out and fall away, leaving small holes behind.
Leaf spot diseases are common during rainy stretches or periods of poor airflow. In many cases, the damage begins as yellow, brown or dark-colored spots before tissue dies and breaks apart.
Water sitting on leaves overnight can also increase the chance of fungal growth, especially in crowded garden beds. This can appear as discolored leaves or soft areas around the holes.
Removing severely damaged leaves can help slow the spread of disease while improving airflow around the plant. However, avoid composting infected foliage if fungal disease is suspected, so you don't unintentionally spread the disease to other parts of your garden.
How to Protect Hostas From Future Damage
If slugs are behind the damage, a few simple prevention methods can help protect hostas and keep future infestations under control.
1. Reduce Damp Hiding Places
Reducing hiding places around hostas can dramatically cut slug populations over time.
"Thick mulch piled directly against the crown, stacked pots, decorative rocks and dense ground cover create a cool daytime shelter where slugs stay hidden until nightfall," explains Greg McKendall, CEO and owner of Kilter Termite & Pest Control. "Keeping the base of the plant cleaner and improving airflow makes the area less comfortable for them."
2. Water Hostas in the Morning
One of the simplest prevention methods is watering earlier in the day instead of at night.
"Wet leaves and damp soil overnight create perfect feeding conditions," Turner says. "Giving the garden time to dry before evening makes the area less appealing."
Morning watering also helps reduce fungal diseases by allowing foliage to dry faster throughout the day.
3. Choose Slug-Resistant Varieties
Purchasing thick-leaved varieties of hostas in the future is also a good idea.
"The thicker leaves are less tasty to slugs, making them more slug-resistant," says Angelika Zaber, lawn care specialist and gardening expert at Online Turf.
Hostas with heavily textured or blue-green leaves are often tougher and less appealing to pests than thinner delicate varieties.
4. Set Up Beer Traps and Copper Barriers
Beer traps get talked about a lot because slugs are attracted to the smell of fermentation.
"A shallow container sunk into the soil can catch them, but think of it more as population control than a complete fix," Turner says.
Copper barriers can work well around individual hostas or raised beds.
"Slugs don't like crawling across copper because it creates a reaction that discourages them," he adds. "It's one of the few passive solutions that works around the clock."
5. Use Iron Phosphate Slug Bait
"Iron phosphate slug bait is usually the product I recommend most often because it targets slugs without creating the higher risks associated with older chemical pellets," McKendall says. "Scatter bait lightly around hostas rather than dumping piles in one spot."
Ground beetles, birds, frogs and toads all feed on slugs, so encouraging these natural predators can help keep populations under control
"Gardens with diverse plantings, moderate mulch layers and fewer pesticides tend to support more of the beneficial predators that naturally keep slug populations lower," McKendall adds.
Related: How to Identify and Treat Common Cucumber Diseases
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This story was originally published June 8, 2026 at 8:45 AM.