Kiwano

Kiwano (Cucumis metuliferus) is a vigorous annual vine in the cucumber family, native to tropical and southern Africa, producing distinctively spined oval fruits with bright orange skin and luminous lime-green, jelly-like flesh. The flavour is mild and refreshing, often likened to a blend of cucumber, passionfruit, and lime. It is notably resistant to root-knot nematodes and many fungal diseases. As a warm-season vine, it demands full sun and fertile, well-drained soil with consistent warmth to thrive.

Growing

Start seeds indoors in pots at a soil temperature of 20–28 °C, sowing 1.2 cm deep. Germination takes 4–10 days. Grow seedlings on for approximately 4 weeks until they are sturdy. Transplant outdoors once soil temperature reaches 15–16 °C and nights stay reliably above 15 °C, spacing plants 100 cm apart along a trellis, fence, or other strong support. Kiwano is an exceptionally vigorous grower and will need robust support as vines extend rapidly.

Care

Water consistently but avoid waterlogging — kiwano prefers fertile, well-drained soil at pH 5.5–7. Apply a balanced fertiliser at planting and a potassium-rich feed once fruiting begins. Train vines onto a trellis and tie in lateral shoots regularly to manage vigour and improve air circulation. Kiwano requires bee pollination; grow in a position accessible to pollinators. Avoid cold storage — fruits are damaged by temperatures below 20 °C.

Harvest

Harvest when the skin transitions from green to full orange. Do not pick before this colour change, as fruit picked early is insipid in flavour. Cut fruits from the vine with a sharp knife, leaving a short stem. Overripe fruits will burst and self-sow readily, so monitor closely once colour change begins. The harvest window extends over several weeks as fruits ripen successively.

In the kitchen

Scoop the jelly-like, seed-filled flesh directly from the halved fruit with a spoon. Use fresh as a snack, in fruit salads, or as a garnish. The mild, fruity flavour pairs well with seafood, yoghurt, and citrus dressings. Blend the flesh into smoothies or cocktails. The flesh can also be used as a colourful garnish or scooped over savoury dishes in the same way cucumber is used.

Storing

Store harvested kiwano at 20–24 °C — do not refrigerate, as cold storage causes rapid deterioration. At the correct temperature, fruits keep for several months and become progressively sweeter over time. Do not stack fruits heavily, as pressure can damage the spines and skin.