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''Actinidia arguta'' (hardy kiwi) is a perennial vine native to Japan, Korea, Northern China, and Russian Siberia. It produces a small fruit resembling the kiwifruit.〔(Hardy Kiwifruit ) Fruit Facts. 1996, California Rare Fruit Growers, Inc.〕 The fruit are referred to as Hardy kiwifruit, kiwi berry, arctic kiwi, baby kiwi, dessert kiwi, grape kiwi, northern kiwi, or cocktail kiwi and are edible, berry or grape-sized fruit similar to kiwifruit in taste and appearance, but are green, brownish, or purple with smooth skin, sometimes with a red blush. Often sweeter than the kiwifruit, hardy kiwifruit can be eaten whole and need not be peeled. Thin-walled, its exterior is smooth and leathery. ==Cultivation== The fast-growing, climbing vine is very hardy (hence the name ''hardy kiwi''), and is capable of surviving slow temperature drops to -34°C (-30°F), although young shoots can be vulnerable to frost in the spring.〔(Hardy Kiwi ) Hardy Kiwi. Dec. 16, 2008, Penn State College of Agricultural Sciences.〕 The vines need a frost-free growing season of about 150 days, but are not damaged by late freezes, provided that temperature changes are sufficiently gradual to allow plants to acclimate. Indeed, a period of winter chill is necessary for successful cultivation. However, rapid freezes will kill off buds and split vines. The vines can also be grown in low-chill areas.〔 While hardy kiwi may be grown directly from seeds (germination time is approximately one month), it is also possible to propagate from cuttings. Hardy kiwi cuttings may be grafted directly onto established kiwifruit rootstock, or rooted themselves. In domestic cultivation, a trellis may be used to encourage horizontal growth for easy maintenance and harvesting; however, vines grow extremely quickly and require a strong trellis for support. Each vine can grow up to 20 feet in a single season, given ideal growing conditions.〔(Hardy Kiwi ) Nan Sterman, National Gardening Association.〕 For commercial planting, placement is important: plants can tolerate partial shade but yields will be optimized with full sunlight. Hardy kiwi vines consume large volumes of water; therefore, they are usually grown in well-drained acidic soils to prevent root rot.〔 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Actinidia arguta」の詳細全文を読む スポンサード リンク
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