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160907_029_Tomato greenback.jpg
Sometimes tomatoes fail to ripen evenly. Either irregular blotchy patches remain hard or the entire stalk end or shoulder of the tomato stays yellow or green – a disorder known as tomato greenback. The cause is a combination of too much heat and light plus potassium deficiency. If it’s very hot or the soil has dried out, it reduces the plant’s ability to absorb nutrients.