Lemon cucumber

Sun

Full sun; aim for at least 6-8 hours of direct sunlight daily.

Water

Keep the root zone evenly moist, especially during flowering and fruiting. Water deeply when the surface soil begins to dry; containers may need daily watering in hot weather.

Soil

Fertile, well-drained soil enriched with compost, preferably pH 6.0-7.0.

Height

6-12 in (0.15-0.3 m) as ground cover; 5-8 ft (1.5-2.4 m) on a trellis

Spread

3-6 ft (0.9-1.8 m) when trailing; allow 1.5-2 ft (0.45-0.6 m) between trellised plants

Flowers

Yellow flowers from late spring or summer until cool weather; separate male and female flowers grow on the same plant.

Foliage

Rough, hairy green leaves with broad, shallow lobes; stems carry curling tendrils.

Growth

Fast in warm weather

Care needed

Medium

• Pollinators
• Low allergen
• Edible

Northern hemisphere months. In Australia, shift them by six.

Difficulty

Moderate

Toughness

Needs looking after

Pick your zone, country, light and whether you have pets.

1. Planting day

   0.5 ft (0.15 m)

2. After 1 year

   0.7 ft (0.22 m)

   full size

Full size in one season.

From a typical nursery size, at an average rate for this kind of plant. A rule of thumb, not a forecast.

Cats and dogs

Safe

Growth rate

Fast

• Plant outside after frost danger has passed and the soil has warmed to at least 60°F (16°C).
• Mix compost into the bed before planting, then mulch once the soil is warm.
• Water at soil level to keep moisture steady and avoid repeatedly wetting the leaves.
• Feed with a vegetable fertiliser according to its label; avoid excessive nitrogen, which encourages leafy growth.
• Install a trellis at planting and guide young stems onto it with loose ties.
• Leave flowers accessible to bees; poor pollination reduces fruit set.

Pruning. Routine pruning is unnecessary. During growth, remove badly diseased leaves and guide or shorten wayward shoots only where needed to keep paths clear.

Begin checking for fruit about 60-75 days after sowing in warm conditions. Pick when the cucumbers are roughly 2-3 in (5-8 cm) across and pale yellow, before they turn deep golden and develop tougher skins and larger seeds. Cut the stalk with scissors and harvest frequently to encourage further cropping.

Late winter

Order seed and choose a sunny bed or a large container with a sturdy support.

Spring

For an early start, sow indoors in individual pots 3-4 weeks before your expected last frost; provide warmth and strong light.

Late spring

Harden off seedlings and plant after frost danger passes and soil warms; alternatively, sow directly into warm soil.

Early summer

Mulch warm soil, guide vines onto supports and begin regular checks for pests.

Summer

Maintain even watering, feed as needed and pick pale-yellow fruit frequently.

Autumn

Harvest remaining usable fruit before frost and remove spent vines; do not leave diseased crop debris in the bed.

• Train up a trellis at the sunny edge of a vegetable garden to keep fruit off the soil.
• Use in a potager with lettuce and culinary herbs, where the yellow fruit adds seasonal colour.
• Grow in a large container with a climbing frame on a sunny patio.
• Allow vines to trail across a mulched vegetable bed where there is room for their full spread.

Garden styles it suits: Potager (kitchen garden), Cottage garden, Edible landscape, Homestead, Family-friendly and Small-space.

Plant it with: Lettuce, Dill, Nasturtium, French marigold and Bush beans.

Wildlife: Flowers provide pollen and nectar for bees. Insect mesh must be removed or opened during flowering unless you hand-pollinate.

• Powdery mildew: white patches develop on leaves, often late in the season. Improve airflow, maintain steady watering and remove badly affected leaves; use a locally approved treatment if needed.
• Aphids: colonies gather on soft shoots and leaf undersides. Dislodge them with water or use insecticidal soap labelled for edible crops, avoiding open flowers.
• Cucumber beetles, especially in North America: beetles chew leaves and can spread bacterial wilt. Protect young plants with insect mesh, removing it when flowers need pollination; remove wilted, infected plants.
• Poor fruit set or misshapen fruit: cold weather, uneven watering or inadequate pollination can be responsible. Keep moisture steady and, if bees are scarce, transfer pollen from a male flower to the centre of a female flower with a small brush.

Ordinary cucumber fruit and foliage are not known to be toxic to people, cats, dogs or horses. Exceptionally bitter fruit can contain high levels of cucurbitacins and cause serious gastrointestinal illness; spit it out and discard the whole fruit rather than eating or cooking it.

• Crystal Apple cucumber (Cucumis sativus 'Crystal Apple')

  Also produces rounded cucumbers, but fruits are usually cream to pale green rather than the characteristic yellow of 'Lemon'; appearance overlaps, so a reliable seed label is the best guide.

• Lemon (Citrus limon)

  A woody evergreen tree with leathery leaves and aromatic, thick-skinned fruit; lemon cucumber is a soft, hairy vine with tendrils.

The cultivar name 'Lemon' refers to the fruit's rounded shape and yellow skin, not its flavour.

Propagation. Grow from seed, either directly in warm soil or in individual pots indoors. Avoid disturbing the roots when transplanting. Saved seed may not grow true if other cucumber varieties flower nearby; reliable seed saving requires controlled pollination and fully mature fruit.

Accepted botanical name

Cucumis sativus

In the US and Canada

Introduced in Hawaii, the lower 48 states, Pacific Basin and Puerto Rico.

Native range

Assam, Bangladesh, China South-Central, China Southeast, East Himalaya, Myanmar, Nepal, Thailand and West Himalaya.

Measured

Average height 200 cm.

Sources: GBIF (CC BY 4.0), USDA PLANTS and Trefle (CC BY 4.0). The care and design notes are LandscapeGPT's own.