Blossom-end Rot on Tomatoes: Cause and Control

Blossom-end Rot is caused by inadequate calcium uptake due to inconsistent moisture, root damage, excess nitrogen or high salt levels in the soil. It can be identified easily as the fruit (either green or ripe) will have black, sunken areas at the blossom ends. Early ripening fruit is the most susceptible and control is best achieved by keeping the garden soil evenly moist and by spraying the plants with seaweed extract when the first flowers open and again when green fruit is visible.