Are aphids harmful to my willow?

They can weaken the tree if the infestation is large, but they rarely kill a mature willow. Managing them early keeps the tree looking its best.

Should I use systemic pesticides?

Avoid systemic pesticides as they can harm beneficial insects. Natural options like insecticidal soap are safer for your garden.

Why are my white willow's leaves curling? Causes and fixes

Check these first

Examine the undersides of the curled leaves for aphids.
Check if the leaves look sticky or have a shiny residue.
Observe if the leaves uncurl when the temperature drops.

Likely causes

Aphid Infestation
Most likely
How to tell: You will see small, soft bodied insects on the undersides of leaves or near the tips of new growth. The leaves may also be sticky from the honeydew the aphids leave behind.
What to do: Spray the tree with a strong stream of water to knock the aphids off. For heavier infestations, apply insecticidal soap or neem oil according to the label instructions.
Heat Stress
Possible
How to tell: The leaves curl inward during the hottest part of the day to conserve moisture. They usually flatten out again once the temperature drops in the evening.
What to do: Increase your watering frequency during heat waves to keep the soil moist. Applying a layer of mulch around the base will help keep the roots cool and retain moisture.

Curling leaves on other plants

Find out what's wrong with your white willow

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 curling is accompanied by yellowing or widespread leaf drop, the tree is under significant stress. It is normal for leaves to curl slightly during extreme heat to protect themselves.

Stopping it coming back

Keep the tree healthy with consistent water and monitor for pests early in the spring when new growth appears.

White willow: curling leaves? Check yours with a photo

Every plant is a little different. Take a photo of your white willow 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 willow?: They can weaken the tree if the infestation is large, but they rarely kill a mature willow. Managing them early keeps the tree looking its best.
Should I use systemic pesticides?: Avoid systemic pesticides as they can harm beneficial insects. Natural options like insecticidal soap are safer for your garden.

Guides to these causes

Aphids

Why are my white willow's leaves curling?

Check these first

Not sure what's wrong with your white willow?