Answer: Blotchy ripening, also called graywall, is usually caused, at least in part, by weather. Cool weather followed by bright, sunny weather can cause this uneven ripening. Excessive foliage growth, which shades the fruit, can also lead to this problem, so it is important not to overfertilize tomato plants with nitrogen. Make sure plants have adequate potassium. An overly wet soil can also contribute to uneven ripening. Some plant diseases can indirectly lead to uneven ripening.
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