Significant crops include avocadoes, kumara, kiwifruit, citrus fruit and olives. Cysteine proteases are commonly encountered in fruits including the papaya, pineapple, fig and kiwifruit. Some fruits, such as avocados, kiwifruit and grapes, also contain vitamin K. There are many kiwifruit and avocados orchards as well as other crops. It is particularly effective for woody plants such as berries, grapes, apples, peaches and kiwifruit. The region has over 11,500 hectares of horticultural land, predominantly producing kiwifruit and avocadoes. Kiwifruit vines require vigorous pruning, similar to that of grapevines. Furthermore, those with latex allergy may also have sensitivities to avocado, kiwifruit, and chestnut. But commercially grown kiwifruit is notoriously difficult to pollinate. With increasing maturity, the fruit softens, similar to a kiwifruit. The flesh should give slightly, as with a ripe kiwifruit. Zespri portfolio of kiwifruit varieties includes SunGold, Green, and Organic. Zespri was formed as a co-operative of kiwifruit growers in New Zealand in 1997. A New Zealand horticulturalist developed the well-known green kiwifruit in Avondale, New Zealand, around 1924. It is particularly famous for the cultivation of kiwifruit.