Planetagarden
Blossom-end rot is caused by insufficient calcium in the tissue of the tomato. ... Since calcium is only moved into the plant with an ample moisture supply, when drought occurs the fruit continues to develop but will be affected by a calcium deficiency.
Can you reverse blossom end rot on tomatoes?
Don't worry if you already have tomatoes suffering from blossom end rot you can still save them. Unfortunately, the fruit that already has the black scab on the bottom can't be reversed.
How do I add calcium to my garden?
Adding lime to the soil in autumn is the easiest answer to how to raise calcium in the soil. Eggshells in your compost will also add calcium to soil. Some gardeners plant eggshells along with their tomato seedlings to add calcium to soil and prevent blossom end rot.
