How to Grow Cucumbers (UK guide)
Cucumbers are a popular summer crop, valued for their crisp texture and refreshing flavour in salads and sandwiches. They need warmth, plenty of space, and regular care for a bumper harvest.
Growing cucumbers in the UK
Cucumbers grow well in greenhouses, conservatories, or sunny patios, either climbing or trained up supports. They need a long, warm growing season, regular feeding, and moisture-retentive compost for best yields.
Grown Vegetables
Delicious homegrown cucumbers from summer to early autumn
How to Grow Cucumbers from Seed
- 01Fill small pots with moist seed compost and sow one seed per pot on its edge.
- 02Cover lightly with compost or vermiculite and place in a propagator or warm windowsill.
- 03Keep at 21–24°C until seeds germinate in 7–10 days.
- 04Grow on in bright, frost-free conditions, watering as needed.
- 05Harden off seedlings before planting outside after all risk of frost has passed.
You will need
- 01Regular watering
- 02Support for climbing
- 03Warm, sheltered spot
- 04Regular feeding
- 05Moist, fertile compost
Plant Calendar
What cucumbers need to thrive
Warmth
Cucumbers need consistent warmth, ideally in a greenhouse or indoors until settled weather arrives.
Moisture-retentive soil
Plant in rich, moisture-holding compost to support rapid growth and fruiting.
Support
Provide trellis or string supports for climbing varieties to save space and avoid sprawling.
Regular feeding
Apply high-potash feed regularly from flowering to encourage fruit set.
Cucumbers: FAQs & Common Problems
Cucumbers FAQs
Pick cucumbers when they reach their mature size, are bright green, and feel firm, usually every few days in mid to late summer to encourage continuous cropping.
Yes, cucumbers thrive in large pots or grow bags with a minimum 30cm diameter. Use peat-free, moisture-retentive compost and ensure excellent drainage.
Feed cucumbers every two weeks with a high-potash tomato feed once they begin flowering to boost fruit production and healthy growth.
Cucumbers require consistently moist soil, so water regularly, especially during hot, dry weather. Avoid letting the compost dry out or become waterlogged.
GROW: Grow your own fruit and vegetables from the earth around you.
