Odd Bottoms on Your Tomatoes?
Have the bottoms of your tomatoes ever been tan and leathery or had black fuzz on the bottom? This is called Blossom End Rot and is caused by a lack of calcium due to uneven soil moisture or cool spring soil temperatures. If you experience Blossom End Rot in the spring (on your earliest tomatoes) it will eventually go away as the soil temperatures warm up. In the future be sure to plant your plants when the soil temperature is above 55 degrees (usually around Memorial Day). If you see these symptoms in the summer, water regularly. (Water when the top 4 inches of soil begin to dry. Water enough to moisten the top 6 to 8 inches.) There is no need to add calcium to the soil or apply it the leaves. Tomatoes with Blossom End Rot are safe to eat — just cut off the affected area.