How To Make Squash Grow Bigger

If you want to know how to make squash grow bigger, you’re in the right place. Getting a larger harvest comes down to a few key practices, from soil prep to pollination. Let’s get straight to the steps that will fill your garden with impressive squash.

Bigger squash start long before you see the first fruit. It begins with choosing the right variety and giving your plants the best possible start. Focus on these fundamentals for success.

Start with the Right Variety

Not all squash are bred to be giants. If your goal is size, select varieties known for large fruit.

For Summer Squash: ‘Cocozelle’ and ‘Zucchini Elite’ are prolific and produce long, substantial fruit.
For Winter Squash: ‘Atlantic Giant’ pumpkin (a type of squash) is famous for size. ‘Blue Hubbard’ and ‘Jarrahdale’ also grow very large.
Always check the seed packet or description for words like “large,” “giant,” or “heavy yields.”

Master Soil Preparation

Squash are heavy feeders. They need rich, nutrient-dense soil to support their rapid growth and large fruit.

Amend Early: Work in 3-4 inches of well-rotted compost or aged manure into the planting area a few weeks before planting.
Check pH: Squash prefer a soil pH between 6.0 and 6.8. A simple test kit can tell you if you need to adjust.
Mound It Up: Plant in raised hills or mounds. This improves drainage, warms the soil faster, and gives roots room to spread.

Perfect Your Planting Technique

How and when you plant sets the stage. Wait until all danger of frost has passed and the soil is warm—at least 70°F.

Create hills about 3 feet in diameter and 6-12 inches high, spaced 4-6 feet apart.
Plant 4-5 seeds per hill, about 1 inch deep.
Once seedlings have two sets of true leaves, thin to the 2-3 strongest plants per hill. This reduces competition.

Water Deeply and Consistently

Inconsistent watering is a major cause of small or misshapen fruit. Squash need a lot of water, especially when flowering and fruiting.

Soak the Roots: Water deeply at the base of the plant, not the leaves. Aim for 1-2 inches of water per week.
Use Mulch: Apply a 3-inch layer of straw or shredded leaves around plants. This retains moisture, suppresses weeds, and keeps soil temperature even.
Morning is Best: Water early in the day so foliage dries quickly, preventing fungal diseases.

The Critical Role of Pollination

Each female squash flower needs to be pollinated to develop into a fruit. Poor pollination leads to small, shriveled fruit that stops growing.

Identify flowers: Female flowers have a tiny squash (the ovary) at the base. Male flowers are on a thin stem.
If you don’t see many bees, hand-pollinate. Pick a male flower, remove its petals, and gently rub the pollen-covered anther onto the stigma in the center of the female flower.
Do this in the morning when flowers are open.

Feed Your Plants for Maximum Growth

Even with great soil, squash benefit from extra feeding during the growing season.

At Planting: Mix a balanced, slow-release organic fertilizer into the soil according to package directions.
When Vines Start to Run: Side-dress with compost or a fertilizer higher in phosphorus and potassium (the second and third numbers on the bag). This promotes flowering and fruiting.
During Fruiting: A monthly dose of liquid fertilizer, like fish emulsion, can give plants a boost for continued production.

Practice Smart Pruning and Plant Management

Don’t be afraid to prune your squash plants. It directs energy to the fruit you want to grow bigger.

Remove some early female flowers to let the plant establish a stronger vine first.
Once several fruit are set, you can pinch off the tips of vines to halt further spreading and focus energy on ripening.
For winter squash, limit the number of fruit per plant. For a giant pumpkin, you might only allow one fruit to develop.

Combat Pests and Diseases Proactively

A stressed plant won’t produce big fruit. Common squash pests like vine borers and diseases like powdery mildew can weaken plants fast.

Vine Borers: Look for frass (sawdust-like material) at the base of stems. You can slit the stem carefully, remove the borer, and mound soil over the wound.
Powdery Mildew: Improve air circulation. Treat with a homemade spray of 1 part milk to 9 parts water or a potassium bicarbonate solution.
Use row covers early in the season, but remember to remove them when flowering starts for pollination.

Know When to Harvest

Harvesting at the right time ensures your squash reach there full potential and store well.

Summer Squash: Pick when they are 6-10 inches long and the skin is still tender and glossy. Frequent harvesting encourages more fruit.
Winter Squash: Let them mature fully on the vine. The skin should be very hard and not pierce with a fingernail. The stem will be dry and corky.
Use pruners or a sharp knife to cut the fruit from the vine, leaving a few inches of stem attached.

FAQ: Getting Larger Squash Harvests

Why are my squash plants flowering but not producing fruit?
This is usually a pollination issue. You likely have male flowers first. Once female flowers appear, hand-pollinate if bee activity is low. Also, excessive nitrogen fertilizer can cause all leaves and no fruit.

Can I use fertilizer to make squash grow bigger?
Yes, but the type matters. Avoid high-nitrogen fertilizers once flowering starts. Switch to a bloom-booster formula or use compost to provide phosphorus and potassium for fruit development.

How much sun do squash really need?
A minimum of 6-8 hours of direct, full sun is non-negotiable for big harvests. More sun means more energy for growth.

Should I remove some squash blossoms?
Yes, this can help. Pinching off a few early female flowers allows the plant to grow larger and stronger before setting fruit, which can lead to bigger squash later on. It’s a good tactic for winter squash especially.

What’s the biggest mistake that keeps squash small?
Inconsistent watering is a top culprit. Letting the soil dry out completely between waterings stresses the plant and can cause it to abort small fruit or produce misshapen ones. Mulch is your best friend here.

By following these steps, you give your squash plants everything they need to thrive. Paying close attention to soil, water, food, and pollination will directly translate to a more abundant and impressive harvest in your garden. The effort you put in now will be clear when you’re harvesting basket after basket of beautiful, large squash.