Bees are surprisingly inefficient at pollinating tomato flowers, often needing to vibrate the blossom to release the pollen. So, do bees pollinate tomatoes effectively, or are they just making a mess of things? The short answer is yes, they do, but only certain types of bees have the right technique.
You might have seen honeybees buzzing around your tomato plants and assumed they were doing the heavy lifting. But the truth is, honeybees are not very good at this job at all. They lack the specific skill required to shake the pollen loose from the tight little pores of a tomato flower.
Do Bees Pollinate Tomatoes
Let’s get straight to the point. Yes, bees pollinate tomatoes, but it is a very specific process. Tomato flowers are different from many other blossoms. They are “buzz-pollinated,” which means they need a strong vibration to release the pollen. This is not a simple transfer of pollen from one flower to another by brushing against it.
Instead, the bee must grab the flower with its jaws and use its flight muscles to vibrate violently. This action shakes the pollen out of the anthers, which are shaped like little tubes. This is why you will see bumblebees and carpenter bees doing the work, while honeybees often just hover around or cut the flowers without pollinating them.
Why Honeybees Fail At This Task
Honeybees are generalist foragers. They are great at pollinating apples, almonds, and clover. But when they land on a tomato flower, they often try to access the nectar from the side. This “side-working” behavior means they do not trigger the buzz needed to release the pollen.
- Honeybees usually steal nectar without pollinating.
- Bumblebees are the champions of tomato pollination.
- Carpenter bees are also very effective, though they can damage flowers.
The Buzz Pollination Process Explained
If you watch a bumblebee on a tomato flower, you will see it curl its body around the yellow cone in the center. It holds on tight and then vibrates its flight muscles. This is called “sonication.” The vibration is so fast that it creates a buzzing sound you can actually hear.
This vibration shakes the pollen grains loose from the inside of the anther. The pollen then lands on the bee’s body. When the bee moves to the next flower, it transfers this pollen, which fertilizes the ovules and leads to fruit development.
How To Attract Pollinating Bees To Your Tomatoes
If you want a better tomato harvest, you need to encourage the right kind of bees to visit your garden. You cannot just rely on honeybees. You need to create an environment that bumblebees and other native bees find irresistible.
Plant Companion Flowers
Bumblebees need a constant source of nectar and pollen, not just from tomatoes. Tomato flowers are not very rich in nectar. So, you need to plant other flowers nearby to keep the bees around.
- Plant borage: This herb is a magnet for bumblebees and has a long blooming period.
- Add lavender: The strong scent attracts many native bee species.
- Grow marigolds: These provide nectar and are easy to grow.
- Include wildflowers: A patch of native wildflowers will support the local bee population.
Provide Nesting Habitats
Bumblebees nest in the ground, often in abandoned rodent holes or under grass clumps. If you have a very tidy garden, you might be removing their potential nesting sites. Leave a small area of your garden a little wild. Do not till the soil too deeply, and leave some leaf litter on the ground.
Avoid Pesticides
This is the most critical step. Insecticides are devastating to bees. Even organic pesticides can harm them. If you must use something, do it in the evening when bees are not active. But for the best results, try to manage pests with natural predators or physical barriers.
Can You Pollinate Tomatoes By Hand?
If you are growing tomatoes in a greenhouse or a high-rise balcony, you might not have any bees around. In this case, you need to mimic the bee’s vibration. This is a simple task that takes a few seconds per flower cluster.
Using An Electric Toothbrush
This is the most popular method for indoor gardeners. The vibration of the toothbrush mimics the buzz of a bumblebee.
- Wait until the afternoon when the flowers are dry and open.
- Turn on the electric toothbrush.
- Place the back of the toothbrush against the stem of the flower cluster.
- Hold it there for 2-3 seconds.
- You should see a small puff of pollen dust release.
Using A Manual Shake
If you do not have a toothbrush, you can simply shake the plant. This is less effective but still works. Tap the main stem of the plant several times. This will dislodge some pollen. You can also use a small paintbrush to collect pollen from one flower and brush it onto the stigma of another.
The Role Of Wind And Other Insects
While bees are the primary pollinators, they are not the only ones. Wind can play a small role, but tomato pollen is heavy and sticky. It does not travel well on the breeze. Other insects like flies and beetles might also transfer pollen, but they are not as efficient as bumblebees.
Interestingly, some growers use “bumblebee hives” commercially inside greenhouses. These hives are specifically designed for tomato pollination. They increase yield significantly compared to hand pollination or relying on wind.
Why Tomato Flowers Need Vibration
The structure of the tomato flower is unique. The anthers are fused into a cone around the pistil. The pollen is hidden inside this cone. It is not exposed on the surface like in many other flowers. This is why a simple brush or a walking bee cannot get to it.
This evolutionary trait might be a way to protect pollen from being washed away by rain or eaten by certain insects. Only the strongest and smartest bees can unlock the pollen.
Signs That Your Tomatoes Are Not Being Pollinated
How do you know if your bees are failing you? Look for these signs:
- Flowers fall off without setting fruit. This is the most common sign.
- Fruit is misshapen. This is called “catfacing” and often results from poor pollination.
- Small, underdeveloped fruit. If only a few seeds are fertilized, the fruit stays small.
If you see these signs, you need to intervene. Start hand pollinating immediately or try to attract more bumblebees to your yard.
Do Other Bees Like Carpenter Bees Help?
Carpenter bees are also excellent buzz pollinators. They are large and strong. However, they have a habit of “slitting” the corolla of the flower to steal nectar. This means they do not always come into contact with the reproductive parts. While they do pollinate, they can be less efficient than bumblebees because of this behavior.
Despite this, having carpenter bees around is better than having no bees at all. They will still vibrate the flowers and release pollen.
Are Native Bees Better Than Honeybees?
For tomatoes, absolutely yes. Native bees like bumblebees, carpenter bees, and even some solitary bees are much more effective. Honeybees are not native to the Americas, and they did not evolve with tomato plants. The tomato plant is native to South America, where bumblebees are the primary pollinators.
Frequently Asked Questions
Do bees pollinate tomatoes in a greenhouse?
Yes, but they need to be introduced. In a closed greenhouse, there are no natural bees. You must either use a commercial bumblebee hive or hand pollinate with a toothbrush. Without either, your tomato plants will not produce fruit.
Why are my tomato flowers falling off?
This is usually due to lack of pollination. If the flower is not pollinated within a few days of opening, it will dry up and fall off. High temperatures above 85°F (29°C) can also cause flower drop, as the pollen becomes non-viable.
Can I use a paintbrush to pollinate tomatoes?
Yes, you can. It is not as effective as vibration, but it works. You need to collect the yellow pollen from the anther cone and gently dab it onto the sticky stigma in the center. Do this on a dry, sunny day.
Do bees pollinate tomato plants at night?
No. Most bees are diurnal, meaning they are active during the day. Bumblebees are active in the early morning and late afternoon. They do not fly at night. If you are hand pollinating, do it in the afternoon when the flowers are fully open.
Will a single bumblebee pollinate many tomato flowers?
Yes, a single bumblebee can visit hundreds of flowers in a single day. They are very efficient. However, they will only pollinate if the temperature is above 50°F (10°C) and the wind is not too strong.
Final Thoughts On Bee Pollination
So, do bees pollinate tomatoes? Yes, but it is a specialized job. You need to look beyond the honeybee and appreciate the bumblebee. If you see bumblebees in your garden, you are in good shape. They are the key to a bountiful harvest.
If you lack them, you can become the bee yourself. Using a simple electric toothbrush is a quick and effective way to ensure every flower sets fruit. It takes a little time, but the reward of a heavy tomato yield is worth it.
Remember to keep your garden bee-friendly. Plant flowers, avoid chemicals, and leave a little wild space. Your tomatoes will thank you. The relationship between the bee and the tomato is a fascinating example of evolution. The flower demands a special skill, and the bumblebee is the master of that skill.
So next time you see a bumblebee clinging to a tomato flower and buzzing loudly, know that it is working hard to give you that perfect, juicy tomato. It is not just a random visitor; it is a vital partner in your garden’s success. And if you don’t have them, you know exactly what to do.