I planted squash seedlings in July—here’s what I actually harvested

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Most gardeners think July and August are too late to sow squash. I planted courgettes and winter squash anyway, and three months later, I’m harvesting bowlfuls. Here’s what actually happened, week by week, and why you might want to do it too.

Why August feels like the end of the growing season

By August, British and American gardeners are deep into maintenance mode. First sowings of courgettes and squash are already productive, the seed catalogues are gathering dust, and the common wisdom says: it’s too late. But August heat is relentless, day length is still substantial, and the first frost is still 12 to 16 weeks away, depending on where you garden. That’s a longer window than most of us think.

The real advantage of a mid-summer squash planting

Late-season squash crops have genuine appeal. Your first plantings are often exhausted by July, succumbing to powdery mildew or simply running out of vigour. A fresh flush of plants established in July will produce clean, disease-free fruit through September and October, landing exactly when you want them for storage and cooking. The plants also face less pest pressure because many squash vine borers and cucumber beetles have already moved on.

Variety choice matters here. Fast-maturing types like ‘Tromboncino’ courgettes or ‘Delicata’ winter squash work far better than slower cultivars. I selected three varieties with maturity dates between 50 and 65 days, calculated from planting to harvest. That timing proved critical.

How to get a late squash crop started in August

The steps are straightforward, but timing and soil preparation make all the difference:

• Sow directly into the ground rather than starting seedlings indoors. In August, warmer soil germinates seeds faster, and direct sowing avoids root disturbance.
• Prepare a rich, moisture-retentive soil bed with well-rotted compost worked 15 centimetres deep. Squash is a hungry feeder and August soil can be depleted.
• Sow seeds 3 centimetres deep in clusters of three, spacing clusters 90 centimetres apart for courgettes and 1.2 metres for winter squash. Thin to the strongest seedling once growth is established.
• Water consistently through the first three weeks. August heat dries soil rapidly, and irregular watering causes blossom end rot and split fruit later on.

What to monitor in the weeks ahead

Watch for germination within 7 to 10 days. Once the first true leaves appear, feed weekly with a balanced fertiliser or diluted seaweed solution. As temperatures drop in September, growth will slow noticeably, but that’s normal. The real test comes in late October when frost threatens. Keep fleece handy, and be prepared to harvest green fruit if a hard frost is forecast; it ripens indoors in a warm kitchen.