Can I eat the fennel if it has aphids?

Yes, just wash the stalks thoroughly in cool water before cooking. The aphids will rinse right off.

Will aphids kill my fennel?

They can weaken it significantly if the population explodes. It is best to treat them as soon as you spot them.

Florence Fennel: pests, causes and fixes

Check these first

Inspect the undersides of the leaves for clusters of small insects.
Look for sticky residue on the foliage.
Check near the base of the plant for ant activity.

Likely causes

Aphid infestation
Most likely
How to tell: You will see clusters of tiny green or black insects on the new growth and stems. They often leave behind a sticky substance called honeydew.
What to do: Spray the plant with a strong stream of water to knock them off. If they persist, apply insecticidal soap or neem oil every 5 to 7 days until they are gone.
Ant farming
Possible
How to tell: You notice ants crawling up and down the fennel stems. Ants protect aphids to harvest their honeydew.
What to do: Place sticky barriers around the base of the plant to stop ants from climbing. Once the ants are gone, the aphids are easier to manage.

Pests on other plants

Find out what's wrong with your florence fennel

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.

When to worry

It is serious if the leaves start curling or turning yellow from the sap loss. A few stray bugs are normal, but a full colony needs immediate treatment.

Stopping it coming back

Encourage beneficial insects like ladybugs to visit your garden by planting flowers nearby. Keep the plants healthy with consistent water to help them resist attacks.

Florence Fennel: pests? Check yours with a photo

Every plant is a little different. Take a photo of your florence fennel 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.

Get the app · Or check it from a photo now, free

Questions people ask

Can I eat the fennel if it has aphids?: Yes, just wash the stalks thoroughly in cool water before cooking. The aphids will rinse right off.
Will aphids kill my fennel?: They can weaken it significantly if the population explodes. It is best to treat them as soon as you spot them.

Guides to these causes

Aphids

Why are there tiny bugs on my Florence Fennel?