Why do zucchini flowers drop without producing fruit?

Zucchini blossom drop can often be a cause for concern, but it is typically a normal sign of plant development. Male flowers come first and fall off the plant after pollinating. This is perfectly alright. Problems arise when the female flower falls off before it can form fruit. This indicates an issue with pollination that needs to be addressed. I had a panic attack in my first season, before I learned of this pattern.

The female flowers are identified by their fruit-like, small base at the blossom. The male flowers are on slender stalks and lack the swelling characteristic of the female blossoms. During periods of pollination trouble, the females become yellow and fall off within 48 hours. This condition occurred in the writer's garden during a rainy week until he began pollinating the blooms by hand.

Combat heat stress through irrigation and shade. Water deeply at the soil level before high heat. Fit shade cloth to block the sun at midday, about 30%. This keeps flowers looking viable longer. My success was doubled after the afternoon shade was provided.

Tackle nutrient problems that lead to weak flowers. Test the pH of the soil to be sure it is between 6.0 and 7.0. Use fertilizer high in phosphorus when buds are formed. Epsom salt sprays are ideal for supplying the magnesium required for vigorously blooming plants. The writer now consistently receives good sets of fruit after correcting the soil balance.

Read the full article: When to Plant Zucchini for a Bountiful Harvest