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It is called Blossom End Rot, and it has plagued tomato growers forever. It is not completely understood, but it seems to be exacerbated by not enough calcium in the soil, and uneven watering. Putting a light scattering of lime in the tomato bed when you prepare it in the spring, keeping the water content of the soil even, and mulching the plants all lessen your chances of getting it. But nothing guarantees you wont get it. That's what I meant by "not completely understood".

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13y ago

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Tomatoes rotting on the bottom, known as blossom end rot, is often caused by a calcium deficiency in the plant. This may be due to irregular watering, which affects the plant's ability to take up calcium from the soil. To prevent this, maintain consistent watering practices and check soil pH levels to ensure proper calcium uptake.

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10mo ago
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Q: What causes tomatoes to rot on bottom?
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