Blossom end rot and it's caused by a calcium deficiency. You can buy stuff but a cheap and easy way to prevent it is to put a handful of crushed eggshells in the hole before you plant the tomato. The calcium feeds the plant all season and it doesn't cost a penny.
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My tomatoes are beginning to get color but on the bottom of each tomato is a brown spot that grows as the tomato ripens. The inside of the tomato at the bottom is black. Any ideas?
I can't figure out why my tomatoes are turning black. I already watered them with Epsom salt a month ago. Can anybody help?
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