My friend Lu recently sent me some pictures of a weird problem she was having with her tomatoes:
It’s a problem that happens to tomatoes as well as squash, peppers, and some other fruiting vegetables. It’s called blossom end rot and is caused by a calcium deficiency in the plant.
It’s best to check your soil before planting season is underway (.. I forgot too..) since it takes a while for the calcium to be absorbed in the plant. But if you have already planted and are having the same problem, add lime, bone meal or manure to your plants base and scrape it in with a rake, then water well. I suggest planting a few extra tomato plants though, better more tomatoes then none at all!