Are aphids harmful to my marjoram?

Yes, they suck the sap from the plant, which weakens it and can cause leaves to curl or yellow. They can also attract ants and promote fungal growth.

Should I use chemicals to kill aphids?

Avoid harsh pesticides, especially if you plan to eat the herbs. Insecticidal soap or neem oil are safer, effective options for edible plants.

Sweet Marjoram: pests, causes and fixes

Check these first

Look closely at the new growth for clusters of tiny insects.
Check the undersides of leaves for sticky residue.
Examine nearby plants to see if the pests have spread.

Likely causes

Aphid infestation
Most likely
How to tell: You see small green or black insects on the stems and leaf undersides. The leaves may also look sticky or curled.
What to do: Spray the plant with a gentle stream of water to knock the bugs off. If they persist, apply insecticidal soap or neem oil every 5 to 7 days until they are gone.
Stressed plant
Possible
How to tell: The plant is weak from low light or irregular watering, making it a target for pests.
What to do: Move the plant to a spot with full sun. Maintain a consistent watering schedule to help the plant recover its natural defenses.

Pests on other plants

Find out what's wrong with your sweet marjoram

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

A few aphids are manageable, but a heavy infestation can stunt growth and spread disease. If the plant is covered in sticky honeydew, act quickly.

Stopping it coming back

Keep your plant healthy with plenty of sunlight and proper watering. Regularly inspect the leaves to catch any new arrivals early.

Sweet Marjoram: pests? Check yours with a photo

Every plant is a little different. Take a photo of your sweet marjoram 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

Are aphids harmful to my marjoram?: Yes, they suck the sap from the plant, which weakens it and can cause leaves to curl or yellow. They can also attract ants and promote fungal growth.
Should I use chemicals to kill aphids?: Avoid harsh pesticides, especially if you plan to eat the herbs. Insecticidal soap or neem oil are safer, effective options for edible plants.

Guides to these causes

Aphids

Why are there tiny bugs on my sweet marjoram?