Our community garden planted rows of tomatoes this summer. The plants are huge and look really healthy but unfortunately, most of the fruit has blossom-end rot. This shows up in my picture as the black spots on the end of the tomatoes. It can be caused by various factors (chemical imbalance, uneven watering, acidic soil) and can happen to peppers, cucumbers and melon as well. A quick internet search provides one with several remedies but when I was discussing this problem with other gardeners this summer, I heard Epsom salt mentioned repeatedly. Epsom salt provides magnesium to depleted soil so this is something we will have to test for before next summer.