A long-healthy African violet with white and green foliage has lost 75% of its leaves to brown centers that spread until leaves die. No pests are visible. Possible causes include water fluctuations (too wet or too dry) or root rot.
Examine roots: blackened roots indicate rot. Check soil moisture consistency—African violets need evenly moist, well-drained soil, never soggy. Avoid wetting foliage when watering. Recent changes in light exposure can also cause stress.
With 75% leaf loss, recovery is unlikely. Consider replacement with a new plant in well-draining African violet mix. Water from the bottom or carefully at soil level. Provide bright, indirect light (north/east window). For expert diagnosis, consult a local nursery with African violet experience rather than a big-box store.
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