Can I save a plant with downy mildew?

It is very difficult to cure once it takes hold. It is best to remove the infected plant to protect your healthy poppies.

Does yellowing mean I need fertilizer?

Usually not. Poppies prefer lean soil, and adding too much fertilizer can actually cause more harm than good.

Opium poppy: yellow leaves, causes and fixes

Check these first

Feel the soil one inch deep.
Inspect the undersides of yellow leaves for fuzzy growth.
Check if the soil drains quickly after rain.

Likely causes

Downy Mildew
Most likely
How to tell: You will see yellow patches on the leaves that eventually turn brown, often accompanied by a fuzzy growth on the underside. This happens most often in cool, damp weather.
What to do: Remove and destroy any infected plant parts immediately to stop the spread. Improve air circulation around your plants by thinning them out and avoid overhead watering.
Overwatering
Possible
How to tell: The lower leaves turn yellow and feel soft or mushy. The soil stays wet for more than a week.
What to do: Let the top inch of soil dry out completely before adding more water. Ensure your garden bed has excellent drainage so water does not pool around the roots.

Yellow leaves on other plants

Find out what's wrong with your opium poppy

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

If the yellowing spreads rapidly across the whole plant, it is likely a fungal infection that requires removal. A few yellowing leaves at the very base of a mature plant are usually just normal aging.

Stopping it coming back

Space your poppies at least 10 to 12 inches apart to ensure good airflow and always water at the base of the plant rather than over the foliage.

Opium poppy: yellow leaves? Check yours with a photo

Every plant is a little different. Take a photo of your opium poppy 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 save a plant with downy mildew?: It is very difficult to cure once it takes hold. It is best to remove the infected plant to protect your healthy poppies.
Does yellowing mean I need fertilizer?: Usually not. Poppies prefer lean soil, and adding too much fertilizer can actually cause more harm than good.

Guides to these causes

Downy Mildew

Why are my opium poppy leaves turning yellow?