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By Bobbie Whitehead
Recent high temperatures nearing the 100-degree mark in June may have caused blossoms on fruit and vegetable plants to fall off or dry up.
Stress on plants, particularly squash, peppers and tomatoes, from high temperatures tends to cause this blossom dropping, and though watering adequately can help, the blossoms may continue to fall.
Recent high temperatures nearing the 100-degree mark in June may have caused blossoms on fruit and vegetable plants to fall off or dry up.
Stress on plants, particularly squash, peppers and tomatoes, from high temperatures tends to cause this blossom dropping, and though watering adequately can help, the blossoms may continue to fall.
High temperatures above 85 degrees can cause blossoms to dry up and fall off the vine.
Gardeners may find blossom drop in tomatoes, squash
“Despite the fact that tomatoes evolved in the tropics, flowering in tomatoes is sensitive to temperature,” according to the Alabama Cooperative Extension System article, “Blossom Drop in Tomatoes.”
“When day temperatures exceed 85°F and night temperatures exceed 72°F, tomato flowers will abort.”
The flower aborting most likely occurs during extended periods of high temperatures, the ACES writes. Though some gardeners may attribute the loss to nutritional deficiencies, they’re typically not the cause. In fact, since some Southeastern U.S. areas experienced temperatures 90 degrees and above for 13 to 23 days, as indicated by local and national weather reports, plants susceptible to the heat may lose their blossoms.
“The longer the plants are exposed to these high temperatures, the longer the condition will last and the more serious the effect on flowering,” the ACES writes.
Along with lengthy duration of high temperatures, the ACES notes that even if day temperatures remain at 85 degrees or below, higher than 70-degree night temps can also cause the blossoms to drop.
Heirloom varieties and some new hybrids can be affected. The plants, though, will produce new flowers when the heat wave passes. Until then, the ACES suggests protecting the plants from pests as well as keeping them watered and fertilized, if nutrients are needed.
For the next season, gardeners not set on growing heirloom varieties might want to look for newer tomato plant varieties, referred to as “heat set” varieties,” bred to tolerate hot temperatures, according to the article.
In addition to tomatoes, peppers, squash and green beans, too, can suffer from blossom drop once the temperatures exceed 85 degrees.
“High temperature interferes with pollination, resulting in blossom drop, crooked or deformed pods due to the lack of ovule development,” writes Henry G. Taber, Iowa State University Extension Service vegetable specialist, in the article, “Green Bean Production.”
During days of extreme temperatures and little rain, gardeners should water the plants since even a shortage of water can cause blossom drop, particularly with peppers, according to the University of Rhode Island GreenShare article, “Factsheet: Peppers.”
Even if the fruit has begun to set during high temps, fruit on these sensitive plants may turn out small, URI GreenShare explains.
“When day temperatures exceed 85°F and night temperatures exceed 72°F, tomato flowers will abort.”
The flower aborting most likely occurs during extended periods of high temperatures, the ACES writes. Though some gardeners may attribute the loss to nutritional deficiencies, they’re typically not the cause. In fact, since some Southeastern U.S. areas experienced temperatures 90 degrees and above for 13 to 23 days, as indicated by local and national weather reports, plants susceptible to the heat may lose their blossoms.
“The longer the plants are exposed to these high temperatures, the longer the condition will last and the more serious the effect on flowering,” the ACES writes.
Along with lengthy duration of high temperatures, the ACES notes that even if day temperatures remain at 85 degrees or below, higher than 70-degree night temps can also cause the blossoms to drop.
Heirloom varieties and some new hybrids can be affected. The plants, though, will produce new flowers when the heat wave passes. Until then, the ACES suggests protecting the plants from pests as well as keeping them watered and fertilized, if nutrients are needed.
For the next season, gardeners not set on growing heirloom varieties might want to look for newer tomato plant varieties, referred to as “heat set” varieties,” bred to tolerate hot temperatures, according to the article.
In addition to tomatoes, peppers, squash and green beans, too, can suffer from blossom drop once the temperatures exceed 85 degrees.
“High temperature interferes with pollination, resulting in blossom drop, crooked or deformed pods due to the lack of ovule development,” writes Henry G. Taber, Iowa State University Extension Service vegetable specialist, in the article, “Green Bean Production.”
During days of extreme temperatures and little rain, gardeners should water the plants since even a shortage of water can cause blossom drop, particularly with peppers, according to the University of Rhode Island GreenShare article, “Factsheet: Peppers.”
Even if the fruit has begun to set during high temps, fruit on these sensitive plants may turn out small, URI GreenShare explains.
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