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UI Extension Publications and Multimedia

Blossom-End Rot in Tomatoes

Product Details
BUL 993
Pub. Date: 2021

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Any gardener gets discouraged when they see a dark, leathery patch develop on the bottom end of their vine-ripened tomatoes. The blemish indicates blossom-end rot, a calcium-deficiency disorder that often afflicts tomatoes. This Idaho Green Thumb How-To tells you the basics about this frustrating condition, including what it is, what causes it, how to discourage its development in your garden, and how to manage it if it does. Color photographs help you distinguish its identification in other plants and from other disorders that can plague the red fruit.

Author: Ronald Patterson

1200 words


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University of Idaho Extension


Physical Address:
E. J. Iddings Agricultural Science Laboratory, Room 10
606 S Rayburn St

Mailing Address:
875 Perimeter Drive MS 2332
Moscow, ID 83844-2332

Phone: 208-885-7982

Fax: 208-885-9046



Barbara Petty