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Sunflower · Helianthus annuus

What is eating my sunflower?

Sunflowers are magnets for insects, especially the sunflower moth. Look for holes in the flower head or caterpillars hiding among the seeds.

Not sure it's this? Check a photo of your plant for free

pests on a plant
Photo: Jules Verne Times Two, CC BY-SA 4.0

Check these first

  1. Examine the center of the flower head for webbing.
  2. Look at the undersides of leaves for tiny bugs.
  3. Check for holes in the leaves or petals.

Likely causes

  1. Sunflower Moth

    Most likely

    How to tell: You see small caterpillars feeding on the developing seeds and flower heads. They often leave behind webbing and frass.

    What to do: Pick the caterpillars off by hand if the infestation is small. For larger issues, use an organic insecticidal soap or Bt spray.

  2. Aphids

    Possible

    How to tell: Tiny green or black insects cluster on the new growth and undersides of leaves. They cause leaves to curl and stunt growth.

    What to do: Blast the aphids off with a strong stream of water from your hose. If they persist, apply neem oil to the affected areas.

Pests on other plants

Find out what's wrong with your sunflower

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

If you see significant damage to the developing seeds, the flower head may fail to mature properly. Catching pests early is essential.

Stopping it coming back

Check your plants every few days for early signs of insects. Keeping the plant healthy with proper water and sun helps it resist damage.

Sunflower: pests? Check yours with a photo

Every plant is a little different. Take a photo of your sunflower 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.

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Questions people ask

Are these pests going to kill my sunflower?
Most pests just cause cosmetic damage or reduce seed yield. They rarely kill a mature, healthy sunflower.
Can I use pesticides on my sunflowers?
Stick to organic options like neem oil or insecticidal soap, especially if you plan to harvest the seeds later.

Guides to these causes

More problems with Sunflower

Back to the Sunflower guide

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.