Blossom end rot. It's the lack of calcium available to the fruit that causes the black bottom and rot. Calcium is plentiful in the soil, but uneven watering habits prevent its transfer on a regular basis. Soil moisture transports many trace minerals, including calcium to tomato fruit cells. Somewhere, some time, your soil dried out and broke the chain of calcium from the dirt to the fruit. SO to prevent this happening again...water regularly--preferably with a drip system or soaker hose-- and apply a thick layer of mulch to conserve soil moisture. Doreen Howard -----Original Message----- From: DannoMusic@aol.com <DannoMusic@aol.com> To: tomato@GlobalGarden.com <tomato@GlobalGarden.com> Date: Saturday, June 05, 1999 5:06 PM Subject: [tomato] Rotten tomato bottoms >Yesterday I pulled two Terrific breed tomatoes off the vine because they were >black on the bottem and appeared to be rotting (although the tops looked >normal). Today I noticed another of my tomatoes >( Mr. Stripey breed) might be beginning to have the same problem. What is >probably going on? > Thanks, > --Michael > >