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Pollinating tomatoes by hand can ensure that more fruit develops.
By
Megan Hughes
Megan Hughes
Megan Hughes has a passion for plants that drives her to stay on top of the latest garden advancements and time-tested ways of growing great plants. She travels regularly to learn about new plants and technology and is closely connected to the innovation side of the horticulture industry. She has more than 25 years of experience in horticulture.
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Updated on June 23, 2023
Sun-ripened tomatoes are the result of thousands of pollen grains moving at just the right time to pollinate flowers. All types of tomatoes—from beefsteaks that are larger than your hand to bite-size grape tomatoes—are usually pollinated by insects or the wind. But when pollen doesn’t naturally get where it needs to go, you’ll end up with flowers but no fruit. In this case, a little human intervention may be needed. This guide will show you how to pollinate tomatoes by hand to increase your harvest.
Are Tomatoes Self Pollinating?
Similar to related plants such as eggplants and peppers, each tomato flower has both male and female plant parts that allow it to self-pollinate. The pollen simply needs to move from the anther (male plant part) to the stigma (female plant part), all within the same flower. Insects, usually bees, or a strong breeze will transfer the lightweight pollen grains from anther to stigma.
Pollination can be compromised when tomatoes are growing in a location protected from the wind, such as an enclosed patio or near buildings that block air movement. Tomatoes growing indoors lack both wind and bees to help with pollination.
Other hurdles to pollination include very wet or humid conditions during flowering. Pollen clumps when wet and doesn’t move well, preventing pollination. Extreme dry conditions also present a problem because the usually sticky stigma becomes dry so pollen has trouble adhering to it.
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When to Pollinate Tomatoes by Hand
The best time to hand pollinate tomatoes is shortly after the flowers open fully. Tomato flowers often remain open for a few days, providing an ample window for pollination. You can pollinate tomato flowers anytime from late morning through early evening. Avoid early morning when the flowers are wet with dew. The dew causes the pollen to clump together, making it difficult to transfer.
How to Pollinate Tomatoes
Hand pollinating tomatoes is a simple process because each tomato flower contains both male and female plant parts. With the right timing and techniques, you can help move pollen where it needs to go to produce fruit.
1. Select dry tomato flowers.
Hand pollinate tomato flowers when they are thoroughly dry. Avoid morning when flowers are damp with dew and late evening when dew descends on the garden. Wait at least two hours after a rain event before hand pollinating.
2. Move the pollen.
No special tools are needed to pollinate tomatoes—just tap on the base of the flower with your finger. The movement will dislodge the pollen and gravity will help at least some pollen grains fall on the stigma. Some people find a thin pencil helpful for tapping the base of flowers in tightly packed flower clusters. Electric toothbrushes are the tool of choice for others. Touch the tip of the vibrating toothbrush to the base of the flower for a few seconds.
3. Repeat daily for 3 days.
Hand pollination is most successful when the flowers are hand pollinated for 3 consecutive days. The repetition accounts for immature pollen grains and mediates weather challenges by offering multiple opportunities for the pollen to transfer to the stigma.
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Frequently Asked Questions
How can I tell if a tomato flower has been pollinated?
You know pollination is successful when the flower petals fade, dry, and fall off and you see a tiny immature tomato forming where the flower was.
Besides hand pollinating, how can I increase pollination for my tomato plants?
Tomatoes are most commonly—and most effectively—pollinated by the wind or insects. While there isn’t much you can do about the amount of wind moving through your garden, you can invite more hardworking, native bees and other insects into your tomato patch to help with pollination. Roll out the welcome mat by providing food, water, and shelter.
Why do I have a lot of tomato flowers but not much fruit?
Assuming you've got plenty of pollinators and breezes doing their thing, or that you've followed best practices for hand pollinating tomato flowers, it could be too hot. When day temperatures are above 90°F and night temperatures are above 75°F, tomato pollen isn't viable. So even if it lands where it's supposed to, it won't pollinate the flower.
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