How to Hand-Pollinate Squash
If you see plenty of flowers on your squash plants but no fruit, you may have a pollination problem. Gardening expert Madison Moulton teaches you how to take matters into your own hands and hand-pollinate your squash plants in four easy steps.
Pollination is pivotal to a successful squash harvest but doesn’t always go as planned. The pollinator population may be scarce in your area, or weather conditions may not be conducive to the buzzing activity required to deliver squash fruits. That’s where hand pollination comes in.
You can maximize your harvest in just a few minutes by pollinating your squash plants yourself. And you don’t need complicated tools or specialist knowledge to get it right. Hand pollination can be done in four easy steps (or three if you use a paintbrush). Try it this season to see the benefits for yourself.
Why Pollination Is Important
We all know pollination is essential for plant growth and reproduction. But pollination isn’t exactly the same for all plants.
Some plants are self-fertile, producing compatible male and female flowers on one plant or male and female parts in the same flower. Others need to be cross-pollinated with different plants to successfully produce fruit.
Squash plants produce separate male and female flowers on one plant. The pollen must be transferred from the male flower to the female flower for fruit to develop. Without it, the flowers will drop off the plant, or the fruit will not fully develop.
Unfortunately, this means your harvest relies on the help of pollinators like bees. Declining pollinator populations, therefore, also mean a decline in your squash harvest – one of the reasons why attracting and supporting pollinators is so essential.
Other factors like weather and time of year can also affect how active pollinators are in your garden. Plus, it may be difficult for pollinators to reach the plants of gardeners growing in enclosed areas like greenhouses.
Luckily, you can also take matters into your own hands (literally) by pollinating your plants yourself. Even if there are plenty of pollinators in your garden, hand-pollinating is a way to increase your yield and guarantee success.
The Benefits of Hand Pollination
There is a long list of benefits of hand pollination. Many of these apply to commercial growers or farmers, but home gardeners can also take advantage.
Replacing Lost Pollinators
Lack of pollinator activity in your garden can affect all flowering plants, including your squash. While there are ways to attract more bees and other pollinators to your garden, this can be a slow process and doesn’t guarantee your squash plants, in particular, will be pollinated.
Encouraging pollinators in your backyard is always a good idea, but hand pollination is a great supplement if populations are very low in your area.
When growing squash plants, the ultimate goal is usually plenty of fruits. But you won’t get as many fruits as possible if female flowers go unpollinated, eventually dropping off the plant.
Hand pollination is essential to get as many female flowers to translate to full fruits as possible. By pollinating plants, you can be sure female flowers have what they need to continue producing.
Cross-pollination is likely if you’re growing a few different types of squash in your garden. Unfortunately, if you’ve found a variety you like, this impacts your ability to grow the same plant from seed the following season.
Hand pollination between male and female flowers on the same plant ensures any seeds you harvest will produce the same squash variety (as long as there is no accidental cross-pollination from bees).
Easy To Complete
Hand pollination may sound technical, but the process is very simple. As long as you know what to look for, it won’t take you more than five minutes, and you don’t need any tools to get started.
Male vs. Female Squash Flowers
Before you start hand pollinating, you need to be able to identify male and female flowers on your squash plants.
In many squash varieties, male flowers will appear on the plant first in the season. These flowers have straight stems behind them and a stamen in the center that holds the pollen. Squash plants will often have more male flowers than female, but this also depends on weather conditions.
Female flowers are easy to spot. Rather than straight stems, they have a bulge at the base – the immature fruit. You’ll see the stigma in the center if you open the flower. Each of these flowers has the potential to turn into whole fruits if successfully pollinated.
Your squash must have both flowers open and ready for pollination. If the pollen in the male flower is not loose or there are few female flowers, wait a couple of days for the blooms to mature before you start.
How To Hand-Pollinate Squash Plants
When you’re ready to pollinate, you don’t need to grab any specialized tools. You may want to use a soft-bristled paintbrush, but even this is unnecessary if you’re willing to sacrifice the male flowers.
Step 1: Identify Male Flowers
Start by identifying all the open male flowers on your squash plant. The pollen should come off when brushed rather than sticking to the stamen, but don’t disturb them too much to keep as much pollen on the anther as possible. You shouldn’t have any trouble if the flower is fully opened.
Step 2: Pick The Flowers
Once you’ve chosen a flower prime for pollination, you can pull it off the plant. Since these flowers won’t turn into fruits and will eventually drop off the plant in a couple of days, you won’t be compromising any of your harvest by removing them.
Cut them off at the stem to keep the structure of the flower intact. Pull gently to stop any pollen from falling off the stamen.
Grab a paintbrush instead if you prefer to leave the flowers on the plant – perhaps for later harvesting and use in the kitchen. Soft-bristled brushes are recommended to catch as much pollen as possible.
Dab the brush directly on the anther to collect the loose pollen. The brush will turn a golden yellow, full of pollen flecks. You can then use the brush to transfer pollen to the female flowers carefully.
Avoid using tools with loose and sticky fibers like cotton balls. The pollen is more likely to stick to these fibers than transfer to the flowers. A soft paintbrush won’t trap as much pollen, giving you a higher chance of success.
Step 3: Open The Petals
Next, you’ll need to expose the stamen of a female flower to easily transfer pollen to the stigma. You’re turning the male flower into its own paintbrush, with the anther at the end.
Pull back the petals slightly so the stamen is the highest point on the flower for easy access. You can also pull the petals off completely if you don’t plan to use the flower for anything else.
Keep the stamen in the center protected no matter which route you choose. It must hold as much pollen as possible to pollinate one or more female flowers.
Step 4: Brush The Pollen Onto A Female Flower
Finally, look out for female flowers and ensure the center stigma is exposed. Then, as any pollinator would do, transfer pollen to the stigma by dabbing the anther. Grab the base of the flower and gently rub the two structures together to transfer the pollen.
And the process is that simple! You can discard the male flower once you’ve hand-pollinated all the female flowers. Within a couple of days, you’ll notice more swelling at the base of the female flower, indicating your pollination efforts were successful.
If any immature fruits aren’t growing and start to rot, it’s best to cut them off the plant. These will draw energy that could be used to produce viable, healthy fruits. Your delicious squash will be ready to trim off and enjoy in a few weeks.
Hand pollination may sound complicated, but it’s a simple process that can boost your harvest with minimal effort. There’s no reason not to give it a go this season!