Blossom end rot looks like the bottom of the tomato is rotting away. The bottom is shrunken and black.

Blossom-end rot is a physiologic disorder associated with calcium. Calcium is required for normal cell growth. When a rapidly growing fruit is deprived of necessary calcium, the tissues break down, leaving sunken lesion at the blossom end. Blossom-end rot is induced when demand for calcium exceeds supply. This may result from low calcium levels, drought stress, excessive soil moisture fluctuations as well as rapid, vegetative growth due to excessive nitrogen. This reduces uptake and movement of calcium into the plant.

Simply, it is a lack of calcium & a watering problem. The plant needed calcium at some point in its development of the fruit and there wasn’t enough water to transport the calcium up to the fruit. So this condition develops.

The solution is to fertilize with Calcium (FOLI-CAL) and be consistent with your watering.

Monterey FOLI-CAL

Tomato Cracking

Cracking of the skins is mostly a problem of inconsistent watering or water availability. The plants take it up and grow too quickly for the skins to expand. It mostly seems to happen when you water after a dry spell.

The solution is to water more thoroughly and more consistently. You will get more consistency and far fewer cracks.

-By Maggie Oldfield Thayer Nursery