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Spruce · Picea glauca 'Conica'

How do I know if my spruce tree has root rot?

It is less common for established spruce trees to get root rot unless they are in heavy, poorly draining soil. Check the soil moisture and the base of the trunk for signs of decay.

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root rot on a plant
Photo: Ninjatacoshell, CC BY-SA 3.0

Check these first

  1. Dig a small hole near the drip line to check soil moisture.
  2. Examine the base of the trunk for any oozing or soft bark.
  3. Check if the tree is leaning or unstable in the ground.

Likely causes

  1. Phytophthora Root Rot

    Most likely

    How to tell: The tree shows stunted growth and the needles may wilt or turn off color. The roots will appear dark, mushy, and smell foul when dug up.

    What to do: Improve soil drainage by amending the surrounding area with organic matter. Avoid watering the tree if the soil is already damp to the touch.

  2. Armillaria Root Rot

    Possible

    How to tell: You might see white fungal mats under the bark at the base of the tree. The tree will slowly decline and eventually die.

    What to do: There is no cure for this fungal infection. Remove the tree and the root system to prevent the fungus from spreading to nearby plants.

Root rot in other plants

Find out what's wrong with your spruce

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

If the tree is leaning or the foliage is turning brown rapidly, the root system is likely severely compromised. This is a serious condition that often leads to tree loss.

Stopping it coming back

Ensure the tree is planted in well draining soil and avoid overwatering. Never pile mulch directly against the trunk of the tree.

Spruce: root rot? Check yours with a photo

Every plant is a little different. Take a photo of your spruce 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.

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Questions people ask

Can I save a tree with root rot?
If caught very early, improving drainage can help. If the roots are already mushy, the tree is usually beyond saving.
How often should I water to prevent this?
Water only when the top 2 to 3 inches of soil are dry. Deep watering every 7 to 14 days is better than frequent light watering.

Guides to these causes

More problems with Spruce

Back to the Spruce guide

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