Q.Basket Grown Tomatoes – What Is Wrong With These?
As the fruit are ripening, one of my basket grown tomato plants is developing fruit with a green/grey area on the bottom. It is not too soft and is isolated to a single basket.
Certified GKH Gardening Expert
That would be blossom end rot. This happens because of a calcium deficiency. Calcium and magnesium interact with each other, so you may want to check for an excess of magnesium, or a true calcium deficiency. Overabundance of macronutrients can be an issue, as well. I would test your soil for nutrient deficiencies, pH imbalances, and unfavorable conditions. Correct anything that is off.
https://www.gardeningknowhow.com/edible/vegetables/tomato/tomato-blossom-rot.htm
https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/testing-moisture-in-plants.htm
https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/soil-ph-plants.htm
https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/testing-soil.htm
https://www.gardeningknowhow.com/edible/vegetables/tomato/tips-for-growing-tomatoes.htm