Are aphids harmful to the whole plant?

Yes, they suck sap and can weaken the plant significantly. They also spread diseases, so it is important to manage them early.

Do California blackberries go dormant?

Yes, they may lose leaves naturally in late autumn or winter as they enter dormancy. This is a normal part of their life cycle.

California blackberry: leaf drop, causes and fixes

Check these first

Inspect the undersides of leaves for aphids.
Check the area for drafts or extreme heat sources.
Look for signs of fungal rust spots.

Likely causes

Aphid Infestation
Most likely
How to tell: You see small insects on the new growth and the leaves begin to yellow or curl before dropping.
What to do: Wash the aphids off with a steady stream of water. If they persist, apply insecticidal soap according to the label instructions.
Temperature Stress
Possible
How to tell: Leaves drop suddenly after a cold draft or a heat wave.
What to do: Move the plant to a location with stable temperatures. Keep it away from heating vents or drafty windows.

Leaf drop in other plants

Find out what's wrong with your california blackberry

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

Worry if the plant is losing leaves rapidly from all branches. It is normal for the plant to shed a few older leaves as it grows new ones.

Stopping it coming back

Monitor for pests weekly and keep the plant in a stable environment away from sudden temperature changes.

California blackberry: leaf drop? Check yours with a photo

Every plant is a little different. Take a photo of your california blackberry 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 the whole plant?: Yes, they suck sap and can weaken the plant significantly. They also spread diseases, so it is important to manage them early.
Do California blackberries go dormant?: Yes, they may lose leaves naturally in late autumn or winter as they enter dormancy. This is a normal part of their life cycle.

Guides to these causes

Aphids

Why is my California blackberry losing its leaves?