The quick answer
It is a calcium-uptake problem, usually driven by uneven watering — not a disease you catch. Steady moisture is the main fix.
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What Blossom-End Rot Is
The quick answer
Blossom-end rot is that dark, sunken spot on the bottom of a tomato. It is a calcium problem inside the plant, and it is usually driven by uneven watering rather than something you can spray away.
What actually helps
- Keep soil moisture steady — deep, regular watering beats feast-or-famine
- Mulch to even out soil moisture
- Do not over-do nitrogen
About calcium
See our note on calcium nitrate before you reach for an additive — the water is usually the real story.
Reviewed for accuracy: TODO_CONTENT.
TODO_CONTENTThis article should be reviewed for horticultural accuracy before launch.
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