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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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12y ago
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Q: What causes tomatoes to rot on bottom?
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