Kiwano / African Horned Cucumber
Kiwano / African Horned Cucumber / Jelly Melon
Cucumis metuliferus
Crop overview
- Crop group
- Cucurbit
- Lifecycle
- Annual
- Growth habit
- Vigorous Prickly Climbing Or Sprawling Vine With Tendrils
This profile covers Cucumis metuliferus grown vertically for its ripe edible fruit, commonly called kiwano, African horned cucumber, horned melon or jelly melon. The fruit is normally harvested when the skin changes from green to yellow-orange or orange and the interior contains green, jelly-like flesh and edible seeds. It does not cover ordinary cucumbers, African wild Cucumis species, pepino melon or bitter melon. Kiwano is an annual crop.
Quick facts
- Plant spacing
- 90 cm – 1.20 m
- Row spacing
- 1.50 m
- Support height
- 1.50 m – 2.10 m
- Support strength
- Medium
- Support types
- Wire Trellis, Heavy Trellis Netting, Sturdy Fence, Reinforced Garden Arch, A-Frame Trellis
- Training method
- Tendril
- Vertical suitability
- Recommended
- Sun requirement
- Full Sun
- Days to harvest
- 100–120 days
Support & training
Training requirements
Install a sturdy wire, mesh or net support before sowing or transplanting. Guide young shoots toward the trellis until the tendrils attach.
Spread the branching vine across open sections of the support and keep developing fruit from becoming trapped in narrow mesh. Wear gloves if the bristly stems and spines irritate the skin.
Pruning requirements
Pruning is optional. Redirect or shorten excessive shoots and remove damaged, diseased or severely congested growth where necessary.
Avoid heavy pruning because fruit develops on continuing lateral growth. In a short season, removing very late flowers and tiny fruit may help earlier fruit finish ripening.
Growing setup guidance
Container
Minimum size: 40 L
Plants per container: 1
Grow one plant in a broad, stable container holding at least 40 L (about 10 US gal) of potting mix. Larger containers provide more stable moisture in hot or windy weather. Provide a firmly anchored medium-strength trellis, consistent moisture and excellent drainage. The stems and fruit are prickly, so leave enough room to train and harvest without brushing against the plant repeatedly.
Raised bed
Plant beside an installed trellis or arch. Raised beds can improve drainage in wet climates and keep the prickly fruit away from paths and soil.
Allow enough room for the branching vine and maintain access for pollination checks and harvest. Redirect shoots before they smother neighbouring crops.
In-ground
Plant in warm, fertile, freely draining soil beside a sturdy support. Maintain even moisture during flowering and fruit enlargement, while avoiding saturated ground.
Allow substantial room because the vine may sprawl or climb vigorously and can smother smaller plants if left unmanaged.
Planting, pollination & harvest
Sowing / transplanting
Direct sow after frost danger has passed when soil and nights are thoroughly warm.
For an earlier crop, start seed in individual containers about 3–4 weeks before planting out. Harden seedlings gradually and transplant carefully after the soil has warmed to at least about 18°C (65°F).
Install the trellis before planting. Kiwano needs a long warm season to reach fully orange ripe fruit.
Pollination
Kiwano produces separate male and female flowers on the same plant and is self-fertile, but insects are needed to transfer pollen reliably.
Bees and other pollinators visit the yellow flowers. Avoid applying insecticides while flowers are open. Hand pollination may help where female flowers repeatedly fail to develop fruit.
Warnings
Kiwano is extremely frost-tender and requires a long warm season to ripen fully.
The stems, leaves and fruit have stiff hairs or spines that can scratch skin. Wear gloves when training vines or harvesting.
The vine can spread vigorously and may self-seed in warm climates. Remove fallen fruit and unwanted seedlings where spreading is a concern.
Watch for aphids, mites, whiteflies, cucumber beetles, caterpillars, powdery mildew, downy mildew, leaf spots, root rots and cucurbit viruses.
General notes
Harvest ripe fruit when the skin has changed from green to yellow-orange or orange. The fruit should be fully coloured and firm, with green jelly-like flesh inside.
Cut fruit from the vine rather than pulling it. Handle carefully because the horns remain sharp.
Ripe fruit can be stored at cool room temperature in a dry, ventilated place. Avoid chilling it in very cold refrigeration for long periods because tropical fruit can suffer chilling injury.
Where green fruit is used in local cuisines, follow cultivar-specific preparation guidance; the main focus of this profile is fully ripe fruit.
Climate guidance
Climate suitability: Recommended
Planting season
Plant in late spring after frost danger has passed and establish early enough to use the full hot summer.
Wet / dry season
Water deeply and consistently during flowering and fruit enlargement. Avoid repeated drought and saturation.
Soil temperature
Plant once soil reaches at least about 18°C (65°F), with warmer soil encouraging rapid growth.
Frost sensitivity
Extremely frost-tender. Harvest coloured or nearly coloured fruit before autumn frost.
Heat sensitivity
Hot summers generally suit kiwano. Extreme heat combined with dry soil may reduce flower and young-fruit retention.
Humidity / disease
Hot rainy periods can increase mildew, leaf disease, mites and aphids. Maintain airflow and drainage.
Sowing guidance
Direct sow into warm soil or transplant seedlings started 3–4 weeks earlier. Install the trellis before planting.
Notes
Fruit may continue colouring after harvest if it has begun turning yellow, but the best flavour develops on fully mature fruit.