Kiwi

Growing Conditions

Growing Zones

Thrives in USDA Zones 7 - 10

Companion Planting

When to Plant

• Transplant

  Plant dormant bare-root or container vines in early spring; install support structure before planting

• Harvest

  Fuzzy kiwi: harvest when fruit yields slightly to thumb pressure and seeds have turned black; ripen off the vine. Hardy kiwi: harvest when fruit is soft and fully sweet, usually September-October

Organic Growing Tips

• Feed with a balanced organic fertiliser in early spring and again after fruit set; avoid excessive nitrogen late in season, which promotes sappy growth susceptible to frost damage.

• Mulch heavily around the root zone to maintain the consistent moisture kiwi needs, keeping mulch away from the trunk to prevent crown rot.

• Prune in late winter while fully dormant: remove all lateral shoots to 2-3 buds from the main cane framework. Summer pinching of vigorous shoots keeps the canopy manageable.

• Protect emerging spring shoots from late frosts with frost cloth; a single hard frost in spring can wipe out the entire year's crop.

Common Pests

• Leaf Rollers
• Root Knot Nematodes
• Botrytis (Grey Mold)
• Phytophthora Crown Rot
• Japanese Beetle

Taxonomy

Kingdom

Plantae

Family

Kiwi family (Actinidiaceae)

Genus

Actinidia

Species

Actinidia deliciosa

Natural History

The fuzzy kiwi (Actinidia deliciosa) is native to the forests of central and southern China, where it grows wild as a woodland vine and has been consumed for centuries. Chinese botanical texts describe it from at least the Tang dynasty (618-907 AD), though it remained a foraged rather than cultivated fruit for most of its history in Asia. Western botany did not encounter it until the late 19th century. Seeds were brought to New Zealand from China by Isabel Fraser in 1904, and New Zealand nurserymen - particularly Alexander Allison and Hayward Wright - developed the improved, large-fruited cultivar that bears Hayward's name and remains the world commercial standard today. New Zealand exporters named the fruit "kiwifruit" in 1959 after the kiwi bird, replacing earlier names like "Chinese gooseberry," partly to avoid Cold War-era marketing difficulties with the word "Chinese." New Zealand dominated world production for decades until Italian and Chilean growers developed major industries. Hardy kiwi (A. arguta) and kolomikta kiwi (A. kolomikta) are related Asian species that reached Western horticulture somewhat later and are now valued for cold-climate fruit growing.

Traditional Use

Traditional uses of kiwi in Chinese medicine primarily involved the roots, bark, and fruit of wild Actinidia species as general tonics and for digestive support. The modern nutritional reputation of kiwi for vitamin C and digestive enzymes is scientifically well-documented but distinct from the historical medicinal tradition.

• Traditional Chinese medicine and folk use - Fruit and root bark

  Wild Actinidia species were noted in Chinese texts for their cooling properties and use in cases of fever, thirst, and stomach complaints. The fruit was consumed when available as a forage food with tonic properties. Root bark preparations were documented in some regional traditions for digestive and urinary complaints, though the plant was never a primary medicinal species in formal traditional Chinese medicine texts compared to major herbs.

• Modern nutritional documentation - Fruit

  Kiwifruit contains roughly twice the vitamin C of oranges by weight and is exceptionally rich in vitamin K, vitamin E, and potassium. It contains actinidin, a proteolytic enzyme that aids protein digestion and is the primary cause of the characteristic tenderising effect when kiwi is used as a meat marinade. Clinical studies have documented improvements in sleep quality, digestive regularity, and platelet function from regular kiwi consumption.

Kiwi is a common food allergen, particularly among people with latex allergy (latex-fruit syndrome); cross-reactivity between latex and kiwi proteins is well-documented. Actinidin enzyme in raw kiwi can cause mouth tingling in sensitive individuals. Kiwi is otherwise a safe fruit with no known toxicity.

This information is provided for historical and educational purposes only and is not medical advice. Always consult a qualified healthcare professional before making decisions related to your health.

Morphology (Plant Structure & Identification)

• Root System

  Vigorous, spreading, relatively shallow root system; roots are sensitive to waterlogging and soil compaction but spread widely in good conditions.

• Stem

  Deciduous woody vine growing 20-30 feet annually if unpruned; new growth has distinctive reddish-brown hairs on fuzzy kiwi. Annual pruning to a trained framework of permanent canes is essential for fruit production and manageable growth.

• Leaves

  Large, round to heart-shaped leaves 3-5 inches across with a velvety underside; attractive foliage provides dense shade on a trellis. A. kolomikta produces striking white and pink variegated foliage.

• Flowers

  Fragrant, cream to white flowers in small clusters; male and female flowers are on separate plants and are easily distinguished - female flowers have a multi-lobed white ovary at the centre, male flowers have prominent yellow anthers.

• Fruit

  Fuzzy kiwi: oval, brown, bristly-skinned fruit 2-3 inches long with bright green or golden flesh and a distinctive sweet-tart flavour. Hardy kiwi (A. arguta): smooth, grape-sized, green to purple, eaten whole without peeling. Both contain a ring of tiny black seeds surrounding a white core.

Known Varieties

Common cultivars worth knowing

• Hayward

  The world commercial standard for fuzzy kiwi; large, oval, excellent flavor, good shelf life. Requires a male pollinator (Tomuri or Matua).

  Best for: Zones 7-9; main-crop fuzzy kiwi

• Issai

  Self-fertile hardy kiwi (A. arguta) producing small, smooth-skinned, sweet fruit; the best choice for single-plant growing. Cold-hardy to zone 4.

  Best for: Zones 4-8; small gardens; no pollinator needed

• Ken's Red

  Hardy kiwi with stunning deep red skin and sweet, full flavour; among the most ornamentally attractive kiwi vines. Cold-hardy to zone 4.

  Best for: Zones 4-8; ornamental value and good flavor

• Arctic Beauty (A. kolomikta)

  Extremely cold-hardy kiwi species (to zone 3) producing small, very sweet fruit; notable for spectacular white and pink variegated spring foliage.

  Best for: Extreme cold climates (zones 3-6); ornamental foliage