Why Your Tomato Flowers Drop (Blossom Drop)
GardenDraft Team · July 12, 2026 · 5 min read
Part of: Plant Problems & Pest Guides
The plant looks perfect, lush, green, and covered in yellow flowers, and then the flowers shrivel and fall with no fruit to show for it. Blossom drop is one of the most frustrating things a tomato grower runs into because the plant can look healthy even when it is under stress. Most of the time, the cause is weather.
Why tomato flowers drop: temperature, usually
Tomatoes are fussy about the temperature at which they'll set fruit, and they drop their flowers when it falls outside a fairly narrow band. Too hot is the most common trigger: when days climb above about 90°F or, especially, when nights stay above roughly 70–75°F, the pollen becomes unviable, the flower can't be fertilized, and the plant aborts it. Too cold does it too, at the other end: nights below about 55°F also prevent fruit set. Either way the flower drops without making a tomato. The good news is that it's self-correcting: when temperatures move back into the comfortable range, fruit set resumes on its own. This is the same temperature sensitivity behind peppers not setting fruit.
The other causes, in order of likelihood
If temperatures are moderate and flowers still drop, run down this short list:
- Too much nitrogen. A big, lush, deep-green plant with lots of leaves and few fruit is the classic sign of overfeeding with nitrogen, which pushes foliage at the expense of fruit. Ease off the nitrogen and switch to a bloom-type feed; see how to fertilize.
- Water stress. Both drought and waterlogging stress a plant into dropping flowers. Aim for steady, even moisture.
- Poor pollination. Tomatoes are self-pollinating but need movement (wind or buzzing bees) to shake the pollen loose. In very still air, on a screened porch, or in muggy weather when pollen clumps, set can suffer. A gentle daily flick of the flower clusters, or just more airflow, helps.
- Too much fruit already. A plant carrying a heavy load sometimes drops new flowers until it catches up.
What to do: mostly, wait
The honest answer to heat-driven blossom drop is patience: you can't change the weather, and the plant resumes setting fruit when it cools. In the meantime, keep the plant healthy and unstressed (even water, a mulch to steady soil moisture and temperature, and no heavy nitrogen) so it's ready to set fruit the moment conditions allow. In very hot regions, light afternoon shade during a heat wave can keep set going, and choosing heat-tolerant varieties bred to set fruit in high temperatures is the durable fix. For other tomato symptoms, work through the tomato leaf diagnosis guide.
Frequently asked questions
- Why do my tomato flowers fall off without making fruit?
- Most often temperature. Days above ~90°F or nights above ~70–75°F make the pollen unviable, and nights below ~55°F also prevent fruit set, so the flower drops. It's self-correcting — fruit set resumes when temperatures return to the comfortable range.
- Besides heat, what causes tomato blossom drop?
- Too much nitrogen (a lush plant with few fruit), water stress from drought or waterlogging, poor pollination in still or muggy air, or an already-heavy fruit load. Keep the plant evenly watered and unstressed and ease off nitrogen.