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Pontic rhododendron · Rhododendron ponticum

Why is my Rhododendron ponticum dropping its leaves?

It is less common for this plant to drop leaves, and it usually happens due to severe moisture stress or root issues. Check your soil moisture levels first to see if the ground is bone dry or waterlogged.

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Check these first

  1. Feel the soil an inch below the surface.
  2. Inspect the roots for dark, mushy decay.
  3. Check if the area around the base is holding standing water.

Likely causes

  1. Phytophthora root rot

    Most likely

    How to tell: Leaves wilt and turn dull before falling off, often accompanied by dark, mushy roots. This happens when the soil stays soggy for too long.

    What to do: Stop watering immediately and check if the soil drains well. If the roots are black and soft, the plant is likely beyond saving, but you can try improving drainage by amending the soil with organic matter.

  2. Severe drought

    Possible

    How to tell: Leaves curl inward and become brittle before dropping off during hot, dry spells. The soil will feel hard and cracked.

    What to do: Water the plant deeply until the soil is moist 12 inches down. Apply a 2 to 3 inch layer of mulch around the base to keep the roots cool and retain moisture.

Leaf drop in other plants

Find out what's wrong with your pontic rhododendron

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 plant is losing a large percentage of its foliage rapidly, it is in serious trouble. It is normal for a few older, inner leaves to drop in late spring as new growth emerges.

Stopping it coming back

Ensure your rhododendron is planted in well draining, acidic soil and avoid overwatering.

Pontic rhododendron: leaf drop? Check yours with a photo

Every plant is a little different. Take a photo of your pontic rhododendron 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 plant with root rot?
If the rot is caught early, improving drainage and reducing water can help. If the majority of the root system is black and mushy, the plant will not recover.
Does my plant need more water in summer?
Yes, rhododendrons need consistent moisture during hot, dry summer months. Check the soil every 7 days during heat waves.

Guides to these causes

More problems with Pontic rhododendron

Back to the Pontic rhododendron 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.