Tomato plants can experience blossom drop, leading to frustration for gardeners hoping for a fruitful harvest. Here are five common causes of blossom drop and ways to help with pollination.
Temperature Extremes: High daytime temperatures above 85°F (29°C) or low nighttime temperatures below 55°F (13°C) can stress tomato plants, leading to blossom drop. Ideal temperatures for fruit set are between 70°F and 85°F (21°C to 29°C) during the day.
Humidity Levels: Humidity that is too high or too low can interfere with pollen release and its ability to stick to the stigma, resulting in poor pollination and blossom drop. The optimal humidity range is between 40% and 70%.
Lack of Pollination: Insufficient wind or a lack of pollinators like bees can hinder pollination. Tomatoes are self-pollinating, but they still benefit from movement to help disperse pollen.
Nutrient Imbalance: Both excessive nitrogen and insufficient nutrients can lead to blossom drop. High nitrogen levels promote leafy growth at the expense of flowers, while low nitrogen can weaken the plant and reduce fruit set.
Water Stress: Inconsistent watering, especially drought conditions, can stress plants and lead to blossom drop. Tomatoes require deep, consistent watering to support healthy growth and fruit development.
By addressing these factors, you can improve the chances of successful pollination and increase fruit set on your tomato plants.