Q.Large Tomatoes With Unformed Base Covered In Grey Skin.
Only present on three greenhouse plants growing large tomatoes (sorry forgotten the type). Other plants in same greenhouse growing smaller varieties are totally unaffected; in fact they are perfect. All plants get the same watering regime.

GKH_Susan
Certified GKH Gardening Expert
Certified GKH Gardening Expert
Answered on August 7, 2023
It looks like blossom end rot, which occurs when the tomato can't take up sufficient calcium from the soil. Here is more:
https://www.gardeningknowhow.com/edible/vegetables/tomato/tomato-blossom-rot.htm
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