Kiwifruit or chinese gooseberry

The kiwifruit (or kiwi) is the edible berry of a cultivar group of the woody vine Actinidia deliciosa and hybrids between this and other species in the genus Actinidia. The Actinidia is native to Shaanxi, China.

The most common cultivars of kiwifruit are oval, about the size of a large hen's egg (5–8 cm / 2–3 in long and 4.5–5.5 cm / 1¾–2 in diameter). It has a fibrous, dull brown-green skin and bright green or golden flesh with rows of small, black, edible seeds. The fruit has a soft texture and a unique flavour, and today is a commercial crop in several countries.

Originally known as the Chinese Gooseberry, the fruit was renamed for export marketing reasons in the 1950s; briefly to melonette, and then to kiwifruit. This latter name comes from the kiwi — a flightless bird and New Zealand's national symbol.

It is not uncommon (outside New Zealand and Australia) for the fruit to be referred to simply as "kiwi".

Actinidia deliciosa is native to southern China, where it is declared as the "National Fruit" of the People's Republic of China.^[3] Other species of Actinidia are also found in India and range east to Japan and north into southeastern Siberia. Cultivation spread from China in the early 20th century, when seeds were introduced to New Zealand by Mary Isabel Fraser, the principal of Wanganui Girls' College, who had been visiting mission schools in Yichang, China.^[4] The seeds were planted in 1906 by a Wanganui nurseryman, Alexander Allison, with the vines first fruiting in 1910.

The familiar cultivar Actinidia deliciosa 'Hayward' was developed by Hayward Wright in Avondale, New Zealand around 1924. It was initially grown in domestic gardens, but commercial planting began in the 1940s. Italy is now the leading producer of kiwifruit in the world, followed by China, New Zealand, Chile, France, Greece, Japan and the United States. In China, kiwifruit was traditionally collected from the wild, but until recently China was not a major producing country.^[5] In China, it is grown mainly in the mountainous area upstream of the Yangtze River. It is also grown in other areas of China, including Sichuan.^[6]

When introduced to New Zealand by Isabel Fraser it was called yáng táo in China. People in New Zealand thought it had a gooseberry flavour and began to call it the Chinese gooseberry, although it is not related to the Grossulariaceae (gooseberry) family.

New Zealand exported the fruit to the US in the 1950s. Among the exporters was the prominent produce company Turners and Growers, who were calling the berries melonettes, because the name Chinese gooseberry had political connotations due to the Cold War. An American importer, Norman Sondag of San Francisco, complained that melonettes was as bad as Chinese gooseberry because melons and berries were both subject to high import tariffs. In June 1959, during a meeting of Turners and Growers management in Auckland, Jack Turner suggested the name kiwifruit which was adopted and later became the industry-wide name.^[2]

Kiwifruit can be grown in most temperate climates with adequate summer heat. Where Actinidia deliciosa is not hardy, other species can be grown as substitutes.

Kiwifruit is commercially grown on sturdy support structures, as it can produce several tonnes per hectare, more than the rather weak vines can support. These are generally equipped with a watering system for irrigation and frost protection in the spring.

Kiwifruit vines require vigorous pruning, similar to that of grapevines. Fruit is borne on one-year-old and older canes, but production declines as each cane ages. Canes should be pruned off and replaced after their third year.

Kiwifruit plants are normally dioecious, meaning that individual plants are male or female. Only female plants bear fruit, and only when pollenized by a male plant. One male pollenizer is required for each three to eight female vines. An exception is the cultivar 'Issai', a hybrid (Actinidia arguta x polygama) from Japan, which produces perfect flowers and can self-pollinate; unfortunately it lacks vigour, is less hardy than most A. arguta forms and is not a large producer.

Kiwifruit is notoriously difficult to pollinate because the flowers are not very attractive to bees. Some producers blow collected pollen over the female flowers. But generally the most successful approach is saturation pollination, where the bee populations are made so large (by placing hives in the orchards) that bees are forced to use this flower because of intense competition for all flowers within flight distance.