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Q.Why does my oleander’s leaves go yellow and drop off?

Anonymous added on August 18, 2020 | Answered

It has flowered really well. This is my second summer to have it.

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Certified GKH Gardening Expert
Answered on August 19, 2020

This could be normal pest invasion that can be treated with horticultural oil. https://www.gardeningknowhow.com/ornamental/shrubs/oleander/oleander-dropping-leaves.htm

If you see the condition overtaking the entire plant, you could have a problem with leaf scorch, which doesn't have a cure:

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