Q. I have many tomatoes, but now the new flowers are falling. Why?


Blossom­ drop is a condition suffered by tomatoes, peppers, snap beans, and some other fruiting vegetables in which the plant blooms but fails to set fruit, and then the blooms die and fall off. Tomato plants lose their blossoms for several different reasons, usually related to some kind of stress. The stress may be nutritional, environmental, or some combination of the two. Extreme temperatures and changes in humidity levels may cause flowers to drop. Anything which interferes with the pollination and ­fertilization process may result in flower drop. Without pollination, which stimulates fruit set, the flowers wither and die.

Tomato blossoms are self-fertile, and a certain amount of self-pollination of tomato flowers does occur. But pollen does not move well by itself from anther to stigma, as evidenced  by the really poor pollination seen in greenhouses when no pollination aid is given.

Shaking by wind or mechanical means can help release the pollen, which drops down (the blossoms normally hang downward) through the stamen tube to the stigma. The best possible motion to release this pollen is provided by a bee that "sonicates." Sonication is the vibration of the wing muscles without flight, causing the whole flower to vibrate, and a cloud of pollen to be released onto the bee's body and, at the same time, onto the stigma.


For tips on a variety of gardening topics, see our Plant Information Guides.
- Courtesy of NYBG Plant Information Service

  • Last Updated Apr 02, 2018
  • Views 40
  • Answered By Anita Finkle

FAQ Actions

Was this helpful? 0   0

Contact Us with your Question by Email

Can't find an answer in our FAQ? Try our Plant and Gardening Guides.

OR, a plant expert will answer your individual plant and garden questions if you contact us by email or use the Quick Form below. Click on the link to send us an email:

Or Submit a Quick Question for a Plant Expert Here

Your Question
Your Info
Fields marked with * are required.