Check these first
- Look closely at the underside of the leaves.
- Check the flower buds for clusters of tiny insects.
- Feel the leaves for a sticky residue.
Likely causes
Aphid Infestation
Most likelyHow to tell: You see clusters of tiny green or black insects on the stems and undersides of leaves. The leaves may look sticky or curled.
What to do: Spray the aphids off with a strong stream of water from your hose. If they persist, apply insecticidal soap every 5 to 7 days until they are gone.
Find out what's wrong with your large flowered tickseed
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.
Scan with your phone's camera to get the app
Or go to pocketbotanist.app/get on your phone
When to worry
A few aphids are normal, but if they cover the entire plant or cause the buds to fail to open, you need to act.
Stopping it coming back
Keep the plant healthy with proper watering and avoid excessive nitrogen, which attracts aphids.
Large flowered tickseed: pests? Check yours with a photo
Every plant is a little different. Take a photo of your large flowered tickseed 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 aphids kill my tickseed?
- They rarely kill the plant, but they can significantly reduce the number of flowers and weaken the overall structure.
- Can I use neem oil?
- Yes, neem oil is effective against aphids. Apply it in the early morning or evening to avoid burning the leaves in the sun.
Guides to these causes
More problems with Large flowered tickseed
- Why are there white spots on my Large flowered tickseed?
- Why is my Coreopsis grandiflora looking leggy?
- Why is my Large flowered tickseed not blooming?
- Why are my Coreopsis grandiflora leaves turning yellow?
- Why are my Coreopsis grandiflora leaf tips turning brown?
- Why is my Coreopsis grandiflora drooping?
- How do I fix root rot in my Coreopsis?
- Why are my Coreopsis leaves curling?
Back to the Large flowered tickseed 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.

