Hardy kiwi (Actinidia arguta and Actinidia kolomikta) is the cold-hardy cousin of the vine that produces the familiar kiwi fruit sold at grocery stores. The latter is the species Actinidia deliciosa and is hardy only to USDA plant hardiness zone 8. Hardy kiwi is much more cold-tolerant and can be grown in zones 3, 4, or 5 (and up to 8 or 9), depending on the variety. Like its warm-weather cousin, hardy kiwi also produces a sweet edible fruit, but the hardy version is smaller (about the size of a large grape) and can be eaten whole, without peeling.While its fruit is delicious, hardy kiwi is grown in landscapes primarily for its attractive heart-shaped foliage. It is a fast-growing, vigorous vine but is rarely invasive in the way that other fast-growing vining plants can be. Kiwis are climbers of the "twining" type that grow well on trellises, fences, pergolas, and other structures. However, the vines can also overcome shrubs and small trees if left unchecked.Hardy kiwi flowers in the spring and produces fruit in the fall. Most varieties are dioecious (separate male and female plants), and females must be pollinated by a male in order to fruit. However, there is one self-pollinating variety that can fruit on its own.