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Indoor azalea dropping leaves: causes and fixes

Rhododendron simsii

Quick answer

Leaf drop on your indoor azalea has a few possible causes, and on this plant the likeliest is a recent change or shock.

Indoor azalea (Rhododendron simsii)
Indoor azalea · Rhododendron simsii
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Toxic to pets

First, check the soil. Push a finger 2 to 3 cm (0.8⁠–⁠1.2 in) into it and lift the pot. Dry and light means thirst. Wet and heavy means too much water or poor drainage.

Most likely cause

A recent change or shock

Pixel illustration of a houseplant just brought home, beside a cardboard box and a shopping bag, with a few green leaves on the floor

How to tell

  • It started dropping leaves soon after you bought, moved, or repotted it.

The fix

  1. 1
    Check moisture and roots before changing anything.
  2. 2
    Keep its spot and care steady and don’t fertilize while it settles.
  3. 3
    If roots were damaged, follow this plant’s repotting guidance.
More about this

Water according to moisture, only when the surface of the soil has dried slightly. Check drainage and do not water just because a calendar says it is time.

Other possible causes

Not a match? Compare the signs below to find the one you have.

Overwatering

Leaves yellow and then drop, and the soil stays wet for days after watering.

The fix

  1. 1
    Ease off watering, check drainage, and inspect for rot in the roots if it feels soft.

Underwatering

Leaves drop after the soil has been bone dry for a while.

How to tell

  • Watch for wilting leaves first.

The fix

  1. 1
    If the soil is bone dry, water thoroughly, then check it more regularly so it doesn’t dry out that far again.

Cold drafts or temperature swings

It sits in a draft, near a cold window, or next to a heater, and leaves fall after a cold snap or a sudden temperature swing.

The fix

  1. 1
    Move it somewhere with stable, draft-free temperatures.

Too little light

It quietly sheds its lower and inner leaves over weeks while new growth stays small and pale.

How to tell

  • Indoor azalea wants bright, indirect light.

The fix

  1. 1
    Give it a brighter position, out of harsh midday sun.

All indoor azalea guides

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