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Great Basin bristlecone pine · Pinus longaeva

Why are my bristlecone pine needles falling off?

Bristlecone pines are tough, but they do shed older needles as part of their natural cycle. Check your soil moisture first, as improper watering is the most common culprit for premature needle loss.

Check these first

  1. Inspect the fallen needles for tiny black spots.
  2. Check the soil moisture level with your finger.
  3. Look for signs of pests on the trunk.

Likely causes

  1. Needle cast fungus

    Most likely

    How to tell: You will notice needles turning yellow or brown before dropping off in large numbers. Look for tiny black fruiting bodies on the surface of the needles.

    What to do: Remove and destroy all fallen needles from around the base of the tree to stop the spread. Apply a copper based fungicide during the spring when new growth begins.

  2. Underwatering

    Most likely

    How to tell: The needles will feel dry and brittle before they drop. The soil will be bone dry and pulling away from the edges of the pot.

    What to do: Water the tree deeply every 7 to 14 days until water runs out of the drainage holes. Ensure the soil dries out significantly between these waterings to keep roots healthy.

Find out what's wrong with your great basin bristlecone pine

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.

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When to worry

It is normal for a tree to drop needles that are 3 to 5 years old. Worry if you see rapid, widespread needle loss on young growth.

Stopping it coming back

Keep the area around the base of the tree clean and ensure it gets full, direct sun.

Keep your great basin bristlecone pine healthy from here

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Questions people ask

Is it normal for my pine to lose needles in the fall?
Yes, it is common for older needles to turn yellow and drop as the tree prepares for winter.
Can I save a tree with needle cast?
Yes, if you catch it early. Keep the foliage dry and use a fungicide to manage the infection.

More problems with Great Basin bristlecone pine

Back to the Great Basin bristlecone pine guide

This article was generated with AI from the plant’s care profile and is general information, not horticultural advice. Read about how we build these guides.