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Black spots on the bottom of tomatoes.

Hi, I have noticed that the bottom of some of my tomatoes have black spots on them that look like they could start rotting. The tomatoes are not touching the ground or anything else. The tomato plant is growing in a small contained planter bed aprox. 5 feet by 5 feet. I have 5 tomato plants growing in the same planter bed. I water at least once a day. It does not appear that any of the other tomatoes growing on the other plants are affected. Please let me know what this is. Thanks,
Submitted by BHGPhotoContest

This is a condition called Blossom End Rot and it's caused by inconsistent watering. If it rains and then dries a lot, or if the plants are watered frequently, but shallowly, this will cause the condition. The best way to prevent this from happening is to keep your tomatoes well mulched. This will maintain a more consistent soil moisture and will lessen the problem with Blossom End Rot."

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