
Why Are My Plant Leaves Turning Yellow?
Start with the pattern: one old leaf, several leaves in wet soil, dry yellowing, or pale speckles with pest marks. Each needs a different response.
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Cane, rex, wax, and tuberous begonias have different light and growth habits. Compare dry injury with expanding lesions, and distinguish dormancy from a soft crown.
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Water when the upper mix begins to dry; avoid wet leaves and soggy soil.
Bright filtered light; direct sun can burn many begonias.
Drainage
medium
Root rot risk
medium
Check whether spots are dry and sun-facing or soft and spreading.
Avoid letting water sit on fuzzy or textured leaves.
Inspect new growth for thrips if leaves distort.
Useful guides

Start with the pattern: one old leaf, several leaves in wet soil, dry yellowing, or pale speckles with pest marks. Each needs a different response.
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Check the root ball, fertilizer history, water source, and air near the leaves. Brown tips are permanent, but the cause of fresh tip burn can be corrected.
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Use the mark’s starting point, texture, and rate of change to choose between watering, salt buildup, sun damage, pests, and a closer disease check.
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Feel the root ball before watering. Dry soil, wet roots, and a dry center after repotting can all leave a peace lily limp.
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Check leaf age, moisture inside the root ball, and pest marks to decide what a yellow monstera leaf needs.
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Use the spot’s location, texture, and change over time to decide whether to check roots, exposure, pests, or leaf disease.
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