
Cucumis sativus
Cucumbers are fast-growing annual vines that produce crisp, refreshing fruits and thrive in warm conditions. They come in indoor (greenhouse) varieties and hardier outdoor (ridge) varieties. Greenhouse cucumbers are usually all-female and grown under cover for seedless, tender fruits, while outdoor cucumbers are rough-skinned ridge types that grow in open ground and require pollination. All cucumbers need full sun, rich soil, and consistent moisture for a prolific summer harvest.
Step-by-step instructions for growing Cucumber
Change the guide to see different planting timelines and tips.
Step by step on growing outdoor (ridge) cucumbers in the open ground.
Fill small pots or modules with peat-free seed compost and sow cucumber seeds on their side about deep. Keep the compost warm (around ) and moist – a propagator or warm windowsill is ideal. Seeds should germinate in about a week.
Once seedlings have a couple of true leaves, transplant each into an individual pot of compost. Keep only the strongest plant if more than one came up per pot. Grow them on in a bright, frost-free place (around ) and keep the compost moist.
April in Admaston is a good time to start hardening off your cucumber seedlings. Gradually accustom them to outdoor conditions by placing them outside during the day and bringing them in at night for about a week. This will toughen them up for planting out.
Transplant your cucumbers outside in April to May once the risk of frost has passed in Admaston. Choose a sunny, sheltered spot. Space the plants about apart if using supports, or up to apart if they will sprawl on the ground. Plant them in rich soil and water in well.
Provide a trellis or canes for the cucumbers to climb and tie in the stems as they grow. Once the main stem has around 7 leaves, pinch out its tip to encourage side shoots. Allow side shoots to grow (pinch their tips after around 7 leaves if they get too long). Do not remove any male flowers on outdoor varieties – they are needed for pollination.
Start feeding about 2-4 weeks after planting out. Use a general liquid feed every couple of weeks to boost growth. Once the plants begin to flower, switch to a high-potash tomato fertiliser to encourage lots of fruit. Keep the soil consistently moist alongside feeding.
Pick cucumbers regularly once they reach a usable size. Cut the fruits off with a knife or secateurs – don’t pull them. Harvesting while fruits are young and green ensures the best taste and encourages the plant to keep producing more cucumbers through the summer.