How to grow cucumber
Overview
Cucumber (Cucumis sativus) is a warm-season vine grown for its crisp, refreshing fruits. It requires consistent warmth and moisture to avoid stress and bitterness, and is best harvested young for peak flavour.
Varieties
- Lebanese — Popular Australian variety, thin-skinned, sweet, ideal for salads.
- Telegraph — Classic long green slicing cucumber, reliable cropper in temperate zones.
- Marketmore — Disease-resistant American heirloom, produces well in subtropical climates.
- Suhyo — Japanese variety, long, slender, crisp, perfect for trellis growing.
Soil Preparation
Cucumber thrives in rich, well-drained soil with a pH of 6.0-7.0. Work in aged manure or compost before planting. Raised beds help in heavy clay soils. Avoid compacted or waterlogged conditions.
Growing Guide
Sow seed 1-2 cm deep in full sun after frosts have passed and soil is warm. Space plants 30-40 cm apart for trellised vines or 60 cm apart for ground sprawl. Use a trellis or support to improve air circulation and fruit quality. Keep soil evenly moist but not waterlogged; mulch to retain moisture. In cooler zones, use black plastic or cloches to warm soil.
Sowing
Sow seeds directly 1-2 cm deep, 2-3 seeds per mound, then thin to the strongest. Germination takes 7-10 days at 20-30°C. In cool climates, start indoors 3-4 weeks before last frost and transplant carefully to avoid root disturbance.
Care
Feed every 2 weeks with a balanced liquid fertiliser high in potassium during fruiting. Remove yellow or diseased leaves to reduce fungal spread. Train vines on a trellis and pinch out growing tips once they reach the top to encourage side shoots and more fruit.
Companion Planting
Plant with dill, beans, corn, radish, and nasturtiums to deter pests and improve pollination. Avoid sage and potatoes, as they may inhibit growth or attract unwanted insects.
Common Pests & Risks
Powdery mildew is common in humid conditions; ensure good airflow and apply sulfur or neem oil. Aphids and mites can be controlled by strong water spray or insecticidal soap. Cucumber beetle may attack young plants; use row covers early.
Harvesting
Harvest cucumbers when they are firm, dark green, and 15-20 cm long for slicing types, or 5-8 cm for pickling. Pick before any yellowing appears, as overripe fruits become seedy and bitter. Regular picking encourages more fruit.
In the Kitchen
Cucumbers are best eaten fresh in salads, sandwiches, or as crudités. They can be pickled in brine or vinegar. Store unwashed in the fridge for up to a week; wrap in paper to prevent moisture loss.
Troubleshooting
Yellow leaves: overwatering or nutrient deficiency – adjust watering and feed balanced fertiliser. Stunted growth: cold soil or late planting – wait for warm soil, use cloches. Bitter fruit: heat or water stress – keep moisture consistent and shade roots. Powdery mildew: poor airflow – trellis vines and remove infected leaves. Misshapen fruit: poor pollination – attract bees with flowers nearby.