Summer squash includes patty pan and crookneck types, tender relatives of courgettes with bushy or trailing habits. Their fruits are best gathered small, when skins and seeds are soft. A few plants provide a cheerful, productive crop through a warm British summer.

When and how to sow

Sow one seed per pot in April or May using peat-free potting compost, keeping seedlings warm in a greenhouse or on a bright windowsill. They dislike root disturbance, so plant outside only after the last spring frost, usually later in Scotland and northern areas. Harden plants off first, then space them 75 cm apart in sunny, compost-enriched soil. A cloche helps during a cool start.

Care

Keep soil consistently moist, watering at the base rather than over leaves. Mulch around established plants with compost to reduce drying and splashing soil. Feed with regular compost applications or a suitable organic feed during cropping. Give trailing sorts room to run, and remove any yellowing leaves to improve air movement.

Common problems

Slugs can destroy young seedlings, particularly after wet weather, so protect plants early and inspect at dusk. Powdery mildew often appears later in summer, especially on stressed plants. Maintain even watering, avoid crowding and remove badly affected foliage. Cold nights can slow growth and cause flowers to abort.

Harvest

Pick fruits young and often, before skins toughen and seeds enlarge. Cut them cleanly with secateurs, retaining a short stalk rather than twisting the fruit away. Frequent harvesting encourages further flowering and fruiting. Check beneath broad leaves every few days, as patty pans can quickly become oversized.

Growing Summer Squash: frequently asked questions

When should I sow summer squash in the UK?

Sow one seed per pot in April or May using peat-free potting compost, keeping seedlings warm in a greenhouse or on a bright windowsill.

What are common problems when growing summer squash?

Slugs can destroy young seedlings, particularly after wet weather, so protect plants early and inspect at dusk.

When is summer squash ready to harvest?

Pick fruits young and often, before skins toughen and seeds enlarge.

General guidance for UK home gardens and allotments. Reference figures are typical values; your exact timing depends on your region, last-frost date and variety. Page updated 19 Sep 2026.