Yellowish spots on ripe skin and hard and greenish inside when I cut my Shirley tomato.

Question

Hi, we have grown several varieties of tomato in the greenhouse this year. All have been treated the same, ie feed and watering but the Shirley tomatoes have developed small yellowish marks on the skin and when cut they are very hard and green inside. All the tomato on the other varieties are fine. Have you any idea what is causing this please?

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Answer 1

This particular strain may require more potassium in the soil, although even that may not help the internal tissue disorder. The yellow spots could represent a canker, but since your other plants are fine, it's hard to say. I would certainly remove them from the greenhouse, just in case, and you may want to see if any of these will ripen internally when off the vine and in a paper bag -- it's worth a try. However, if they are salvageable, you will want to peel them before eating. https://www.gardeningknowhow.com/edible/vegetables/tomato/red-tomatoes-are-green-inside.htm

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