The hollyhock weevil is a small, snout-nosed beetle that feeds on hollyhock plants, chewing holes in leaves and, more importantly, destroying seeds inside developing pods. While the leaf damage is mostly cosmetic, the real problem is what happens out of sight: larvae consume seeds so thoroughly that pods can end up completely empty, preventing hollyhocks from self-seeding for the following year.
What Hollyhock Weevils Look Like
Hollyhock weevils are small gray or brownish beetles with the elongated snout typical of the weevil family. Females have a noticeably longer snout than males, which they use to drill deep into developing flower buds to lay eggs. If you see a tiny beetle with a pronounced “nose” sitting on your hollyhock leaves or buds in midsummer, you’re almost certainly looking at one.
How They Damage Your Plants
Adults and larvae cause two distinct types of damage, and it helps to know both so you can recognize an infestation early.
Adult weevils emerge in spring and immediately begin feeding on buds, tender stems, and emerging leaves. They chew round holes about one-eighth inch across. Because they feed on leaves while the foliage is still furled, the holes multiply as leaves unravel, giving the plant a distinctive “shot-holed” appearance with dozens of small perforations scattered across each leaf.
The more serious damage is invisible until it’s too late. After mating in July and August, females drill into developing seed buds and lay eggs inside individual seeds. The cream-colored, legless larvae hatch and eat the seed from the inside out, growing to about one-eighth inch long over four to six weeks. They pupate right there inside the seed pod. When adults emerge, they chew tiny pinhead-sized exit holes through the pod wall. If you crack open an infested pod, you’ll see circular plugs on the surface of seeds that harbor developing larvae, and in heavy infestations, the pods are completely hollow.
This seed destruction is the core problem for most gardeners. Hollyhocks are biennials, meaning they typically live two years and depend on dropping seeds to produce next year’s plants. A weevil population that consumes most of the seed crop can break that cycle entirely, causing your hollyhock patch to slowly disappear.
Life Cycle and Timing
Hollyhock weevils produce one generation per year. Adults overwinter in leaf litter, mulch, and garden debris near the base of hollyhock plants. They become active in spring as hollyhocks begin growing, feeding on foliage for several weeks before mating season begins in July.
After the female lays eggs inside developing seeds, larvae feed and grow through late summer. They pupate inside the seed pods in August, and most emerge as adults before winter. These new adults then burrow into the surrounding duff and litter to wait out the cold months, starting the cycle again the following spring.
Host Plants
As the name suggests, hollyhock weevils strongly prefer hollyhocks (Alcea rosea). They are specialists on this plant, and while other members of the mallow family could theoretically be at risk, hollyhocks are by far the primary target. If you grow hollyhocks and notice the characteristic shot-hole leaf damage, the weevil is the most likely culprit.
How to Manage Hollyhock Weevils
Because the larvae develop hidden inside seed pods, the most effective strategies focus on breaking the life cycle before eggs are laid or after larvae are trapped inside pods.
Handpicking Adults
In spring and early summer, adult weevils are visible on leaves and buds, especially in the morning when they’re less active. They’re slow movers and easy to pick off by hand or shake into a container of soapy water. Check plants regularly from the time new growth appears through midsummer. Reducing the adult population before mating season directly limits egg-laying.
Removing Seed Pods
This is the single most impactful step. Cutting off and destroying seed pods before adults emerge in late summer removes the next generation from your garden. Don’t compost infested pods, as larvae and pupae can survive. Bag them and throw them in the trash, or seal them in a container in the sun for several days to kill any insects inside. If you want to save some seed for replanting, harvest pods early, inspect them for the telltale circular plugs that indicate weevil larvae, and keep only clean seed.
Fall and Winter Cleanup
Since adults overwinter in leaf litter and debris around the base of plants, thorough fall cleanup reduces the number that survive to spring. Clear fallen leaves, spent stems, and mulch from around your hollyhocks in autumn. This won’t eliminate every weevil, but it removes their shelter and exposes them to cold and predators.
Maintaining Your Hollyhock Patch
Because weevils threaten the self-seeding cycle that hollyhocks depend on, many gardeners find it helpful to collect and store clean seed each year as insurance. Start some seedlings indoors or in a separate area of the garden so you aren’t relying entirely on pods that may be infested. A combination of hand-collecting adults, destroying infested pods, cleaning up debris in fall, and maintaining your own seed supply keeps hollyhock weevils from gradually eliminating your plants.