Cucumbers are productive plants for fresh summer salads and pickling, and a few vines can crop generously. In much of the UK they are most dependable in a greenhouse or polytunnel, although outdoor varieties can thrive in a warm sheltered spot.

When and how to sow

Sow cucumbers under cover in individual pots from April, then plant into a greenhouse, polytunnel or warm outdoor bed after the last spring frost. Harden outdoor plants off carefully. Direct sowing outdoors is possible from late May or June once the soil has warmed.

Care

Provide full sun, shelter and regular watering, avoiding sudden drying out. Train greenhouse types up strings or a trellis to save space and keep fruits clean; outdoor ridge types can sprawl or be supported. Feed only according to the label of a suitable fertiliser, and ventilate under-cover crops well.

Common problems

Slugs, red spider mite and powdery mildew may affect cucumbers, especially in dry or poorly ventilated conditions. Keep plants well watered, improve airflow and remove affected leaves promptly. Check with the RHS or a local garden centre if problems persist.

Harvest

Pick cucumbers young, firm and evenly coloured, before they yellow or become seedy. Cut fruits rather than pulling them from the plant. Harvest frequently to encourage further cropping.

Growing Cucumbers: frequently asked questions

When should I sow cucumbers in the UK?

Sow cucumbers under cover in individual pots from April, then plant into a greenhouse, polytunnel or warm outdoor bed after the last spring frost.

What are common problems when growing cucumbers?

Slugs, red spider mite and powdery mildew may affect cucumbers, especially in dry or poorly ventilated conditions.

When is cucumbers ready to harvest?

Pick cucumbers young, firm and evenly coloured, before they yellow or become seedy.

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.