Hardiness Zone: 6a
Stephen from N.E. Kansas
if it's on the end opposite the stem, it may be 'blossom end rot'.... and that's caused by a lack of calcium in the soil... it should be fixed early in the season before planting.... but for now and this year's tomatoes, there's a spray available at a nursery or feed store that will help... and I've used crushed up TUMS dissolved in water, poured around the plant and then watered in lightly.... those with the black ends are goners... but those that will come from the next flowers should be a lot better.....read here for more info..
Blossom end-rot, which this sounds like it is can be caused by lack of calcuim but also can be caused by either too little water or too much water. I took have found this problem with my tomatoes and when I water correctly I don't have this happen, have only lost about 4 tomatoes to this. (07/26/2007)
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