Updated at: 03-05-2022 - By: Sienna Lewis

You’ve come to the right site if you want to learn how to cultivate squash in a small greenhouse. Growing high-quality squash in a small enclosed space isn’t impossible, despite the fears of those new to greenhouse gardening. Think of the year-round supply of fresh organic produce.

Start by learning that winter and summer squash varieties can be divided into two broad categories. As a result, these classifications do not necessarily reflect the seasonality of squash, but rather the perishability of this food item.

A hard-skinned winter squash like the robust butternut can be stored for months before you decide to eat its seeds. On the other hand, the thinner-peeled but sweeter summer squashes like the courgettes can only be kept for around two weeks before consuming.

Tips for Sowing Squash Seeds

You can grow squash seeds in a compact greenhouse since it allows you to grow plants regardless of the season or weather outdoors. The following steps will help you get started:

Tip #1. Sow one seed per pot.

The seeds of squash need to be started in pots. In terms of length, you’ll want to plant one seed per pot that’s 3 to 4 inches long. Keep in mind that a squash seed only has to be sown about an inch deep before being covered with dirt and watered.

4 Tips: How To Grow Squash In a Small Greenhouse - Krostrade

Tip #2: Choose the right kind of soil.

Squashes thrive in warm soil, but you must ensure that the sort of soil you use is of high quality in order for them to thrive. When mixed with manure or compost, it’d be excellent. In addition, a pH range of 5.5 to 6.8 is ideal for growing squash.

Tip #3: Create an ideal growing environment for your seeds.

When growing squash in a tiny greenhouse, you can maximize the growth potential of your plants. It is possible to regulate the temperature within a tiny greenhouse. Check the temperature and location of your micro greenhouse to ensure that your plants get plenty of sunlight.

Summer squashes thrive in temperatures between 15°C to 23°C, so keep that in mind if you’re growing them. The blooms will wither away as the temperature rises, but the fruit will continue to ripen. Do not forget to check if your seeds are already growing too large for their pots.

Planting your squash seedlings in raised beds is another approach to make sure they have enough room to thrive. Make sure you water your plants on a regular basis. Avoid watering directly over the plants, since this can lead to rotting because of the accumulation of moisture around the plant’s twigs and neck.

Tip #4: Check if the seeds are ready to be moved in larger pots or grow bags

In the end, the seeds you sowed will have to be transplanted somewhere else. Moving them to larger pots is inevitable. When you’re moving your squash seeds, make sure you have enough room for them to grow.

Transporting seeds at the wrong time could result in them being damaged. Squash seedlings can grow quickly if they are properly cared for. When the roots of your squash seeds begin to poke through the bottom of the smaller pots, it’s time to relocate them. The exact timeframe will vary depending on the type of squash seeds you planted and the environment in which they are growing.

Move your plants into pots with at least a 5-inch diameter spout so that their roots have room to expand. Grow bags are required at some point. If you don’t already know, the core root of a squash plant typically generates four to six stems with huge and broad leaves that can readily invade any area.

What are the Benefits of Mini Greenhouse Gardening?

Garden security and additional food savings are just two of many advantages that come with tiny greenhouse gardening, so don’t be afraid to give it a try if you’re on the fence. Here’s a closer look at each one of these advantages:

Your plants will be well-protected

Blizzards, high winds, hail, and severe rain are no match for a greenhouse’s ability to keep your plants safe. Your plants wouldn’t need any special protection from bad weather like you would have to if you were an outdoor grower. Furthermore, you can keep pests and animals out of your greenhouse if you have better control over who enters and leaves.

You’ll save more on grocery shopping

Because you can grow your own organic food in a small greenhouse, you will always have a consistent supply of delicious and fresh stuff. You won’t have to worry about fluctuating food prices owing to weather or transportation costs.

When To Start Growing Squash From Seed

As of the end of March until the end of May, you can begin sowing squash seeds in your greenhouse. You should start the seeds started in little pots, about 3 inches in diameter. One seed per pot should be sown. Spray some water on the seed and cover it with soil.

Squash plants need to be re-potted and moved to a larger pot once the roots have begun to protrude from the bottom of the current pot. The next pot should have a diameter of at least 5 inches.

Squash plants are very susceptible to frost damage. However hardy they appear, seedlings should be protected from late frost by covering them with fleece if a warning has been issued or if a frost is expected.

When To Plant Out Squash in Your Greenhouse

Your squash seedlings will quickly outgrow their pots if they are allowed to develop at their normal rate. This time of year, you should consider placing them into a grow bag or planting them out in your greenhouse or even your garden as soon as the risk of frost has been eliminated.

Protected and sunny areas are ideal for squash plants, and a well-heated greenhouse is ideal for growing squash. Digging in some well-rotted manure or compost will improve the growing conditions for your plants.

Squash plants need a lot of space in a greenhouse because of their wide leaves and propensity to spread out into any open space they find. If you have a greenhouse, raised beds work well for growing squash and other related plants like courgettes because they don’t crowd out other plants and take up a lot of room.

How to grow squash / RHS Gardening

Zucchini seeds

Unlike hybrid seeds, heirloom seeds produce identical crops year after year. It is a lustrous, greenish-black zucchini known as the black beauty heirloom variety. 50 days after planting, it can be harvested when it’s six to eight inches long. A variety of yellow and green zucchinis are also available. Pattypan, scallop, and crookneck versions are also available.

Healthy perks of zucchini

Zucchini is surprisingly nutritious and full of vitamins and minerals. Zucchini has the following health benefits:

  • Electrolytes, fiber, and other nutrients important to a healthy digestive system are found in high concentrations in this beverage.
  • Phytonutrients and antioxidants in this superfood fight inflammation and slow down the aging process.
  • Fat and salt are low in this dish, while potassium and fiber are high. These aid in the regulation of appropriate blood flow.
  • It is well known that zeaxanthin and lutein can help maintain and improve eye health by combating free radicals.
  • B-vitamins, particularly folate and riboflavin, which boost our body’s energy generation, are abundant in this food.
  • People trying to lose weight can benefit greatly from consuming this cuisine, as it is low in calories and rich in water content.

How to grow zucchini in a greenhouse

  1. To start your seeds, fill your two-inch seedling pots half full with the soilless seed-starting mixture.
  2. A zucchini seed should be planted in each container and the dirt should be a half-inch thick around it.
  3. It prefers loamy soil that is rich in nutrients and well-drained.
  4. It will begin to grow within five to seven days. A large container is now the best place for it to grow.
  5. Soilless potting mix should be used in the new large container.
  6. Fill the container up to the brim, but don’t go over the rim.
  7. The potting mix should be soft and pliable once it has been wetted.
  8. The root ball of a zucchini can be grown in a shallow trench in the midst of a container.
  9. Make sure the seedling is slid out of its small pot and into its new container, with the bottom of its stem firmly rooted in the dirt.
  10. To help the seedling adjust to the new pot, gently pat the soil down.
  11. Once a week, give your pet a meal. Add a lot of compost to the soil.

Pollinate your zucchinis properly

Unlike other vegetables, zucchini have blossoms that are both male and female in appearance. Feminine flowers are attached to small fruit, whereas male flowers are found along the slender stem’s margin. Mornings are the best time of day for these flowers to bloom. Pollination is best done in the morning when the air is still warm.

To ensure a successful harvest, zucchinis must be properly pollinated. Using the wrong method of pollination, fruits may appear, but they won’t grow or ripen, and they’ll eventually begin to wilt.

Beneficial insects and adequate ventilation are essential for greenhouse-grown zucchini. Keep windows and doors open to allow pollination, or use a hand pollinator. Here, your best friend is the VegiBee Garden Rechargeable Pollinator! Gather some pollen from the male flower anther and sprinkle it on the stigma of the female flower.


Soil pH should be between 5.5 and 6.8 for zucchini to thrive. Approximately 1.5 to 2.0 dS/m of mineral salts is required. The following table outlines the ideal nutritional ratios for optimal nutrition.


Zucchini plants should be grown at a density of 1.5 to 1.7 plants per square yard. This is to keep Sclerotinia and Botrytis at bay. In order to keep this from happening, make sure that the relative humidity in your greenhouse is kept at a constant level. Remember, however, that a lack of moisture might result in poor growth and even a smaller yield.

You can grow a larger density of zucchinis in double rows and have up to 2.5 plants per square yard in your garden. Smaller fruits will be produced as a result. Keep an eye out for evapotranspiration (ET) losses, depending on the density of your plantings and the weather.

Water properly

Every day or every other day, if the soil feels dry to the touch, you should water it. Every time you water, make sure the soil is well saturated. Pour water into the pot and place it on a saucer or tray to prevent spills. After watering, remove the saucer to avoid water from dripping onto the plant’s roots.

During the growing season, zucchinis need around an inch of water every week. You should avoid handling wet drip irrigation systems at all costs.

Suitable lighting and temperature

As a result, zucchini is referred to as “summer squash” because it thrives during the hottest months. Planting this vegetable in your greenhouse at any time of the year is perfectly OK. Make sure your zucchini gets at least five to six hours of sunlight every day by placing it in a well-lit area of your greenhouse. The ideal temperature range is 65-75 degrees Fahrenheit.

Protect them from pests

With the risk of squash bugs and squash vine borers, zucchini is easy to grow and does not require a lot of money.

Squash vine borers resemble a white caterpillar about an inch long. Until your zucchini dies back, they’ll be able to hide in the plant’s tunnels. Look for holes and yellow sawdust droppings near the vine’s base to thwart this attack. Remove the insect from the stem by cutting it in half, then fill the wound with earth so the plant can re-grow.

Eggs are laid by orange and black adult wasps between April and July. Tiny red and orange eggs can be found near the base of stems and just beneath the surface of the soil. Once you’ve identified them, remove them right away.

Stink bugs and squash bugs are also a problem. It’s common for them to eat the leaves, causing them to dry up and darken. Get rid of the bugs by putting in some nasturtium, radicchio, or French marigold plants in your garden. Alternatively, you may try to capture or exterminate the adult population.

You won’t be harmed by cucumber beetles with striped or spotted patterns, but they carry bacterium that causes zucchinis to wilt. Once your plants are infected, you’ll have to start fresh with a new seed.

It is important to progressively mulch the area and remove all of the weeds that spring up. It protects your zucchini against infections that may be lurking around the corner.

Time to harvest

Zucchini can be harvested in around two months, or 50 to 70 days. When they are around six to eight inches long, they are ready to be harvested and taste the best. Cut them using scissors rather than yanking on them, which could damage the surviving seedlings’ roots. Alternatively, you can delicately twist them off the stem. If they’re grown too long, they’ll start to rot and lose their flavor. If you’re going to harvest or prune zucchini, make sure to use gloves because the stems have prickles.

Greenhouse Growing Guide: Squash and Potatoes

How to save zucchini seeds

You should leave your zucchini on the plant until it is fully mature. After harvest time, it usually takes two to three weeks to process. Let them rest for four to six weeks after harvesting them from the vine. Remove the seeds by slicing them open.

Location the seeds out to dry in a cool, dry place after rinsing them with water. Excess substances can be removed by screening them. Soak the seeds in a low-humidity, chilly environment. If properly dried and preserved, the seeds can persist for three to four years.

Learn How to Grow Squash in a Small Greenhouse Today!

Now is the greatest time to learn how to produce squash in a tiny greenhouse and get the rewards that come with it.