Pocket Botanist
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Check these first
- Inspect the undersides of the leaves for webbing or clusters of insects.
- Look for skeletonized leaves or large beetles on the foliage.
- Check for sticky residue on the stems or leaves.
Likely causes
Japanese beetles
Most likelyHow to tell: You will see leaves that look like lace or skeletons because the beetles eat everything but the veins. They are large, metallic green and copper beetles that are easy to spot during the day.
What to do: Handpick the beetles off the plant in the early morning when they are sluggish. Drop them into a bucket of soapy water to kill them. For heavy infestations, use a neem oil spray in the evening.
Aphids
Most likelyHow to tell: These tiny, soft bodied insects cluster on new growth and flower buds. They cause leaves to curl and leave behind a sticky substance called honeydew.
What to do: Blast the aphids off with a strong stream of water from your garden hose. If they persist, apply insecticidal soap directly to the colonies every 5 to 7 days.
Spider mites
PossibleHow to tell: Look for tiny yellow dots on the leaves and fine, silky webbing between stems. These pests thrive when the weather is hot and dry.
What to do: Increase humidity around the plant by misting or watering the soil thoroughly. Apply horticultural oil to the foliage to smother the mites.
Find out what's wrong with your rose mallow
The list above covers the usual causes. Pocket Botanist looks at a photo of your actual plant and tells you the likely cause, how serious it is, and what to try first. Identification and a health check are free.
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When to worry
Worry if the plant is losing more than half its foliage or if the buds are failing to open. A few bugs are normal, but a full infestation can weaken the plant significantly.
Stopping it coming back
Keep your Rose Mallow well watered to reduce stress, as healthy plants resist pests better. Regularly inspect the plant during the peak of summer.
Rose mallow: pests? Check yours with a photo
Every plant is a little different. Take a photo of your rose mallow and Pocket Botanist tells you which cause is most likely, how serious it is, and what to try first. A few checks a day are free. Save the plant and you get care reminders timed for it.
Scan with your phone's camera to get the app
Or go to pocketbotanist.app/get on your phone
Get the app · Or check it from a photo now, free
Questions people ask
- Will these bugs kill my plant?
- Most pests just cause cosmetic damage, but a heavy infestation of Japanese beetles or spider mites can stunt growth. Treat them early to keep your plant healthy.
- Can I use chemical pesticides?
- It is better to avoid harsh chemicals because they can harm beneficial pollinators like bees. Stick to soaps, oils, or handpicking.
Guides to these causes
More problems with Rose mallow
- Why is my Rose Mallow not blooming?
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This article was generated with AI on from the plant’s care profile and is general information, not horticultural advice. Read about how we build these guides.