Blossom-end rot is first seen when tomatoes are one-third to one-half full size. (Photo by Patrick Byers, University of Missouri Extension)
When tomatoes, peppers, melons, and eggplant develop a sunken, rotten spot on the end of the fruit it’s not caused by a disease or insect pest. It happens when the plant doesn’t get enough calcium. It’s a fairly common garden problem. Turns out there are lots of things that can happen that can deny calcium to your plants.
Today’s guest is David Trinklein, horticulture specialist for University of Missouri Extension. He discuss the causes and how to prevent it.

 
 
Growing Home Garden Tomatoes