Hardy Hibiscus, noted for its huge flowers, differs from the original tropical ones in several ways. These perennials are usually obtained from cross-pollinated parent stock and have many advantages over the tropical variety. They require very little watering and care once established and are less prone to insect and leaf problems. The stunning flowers of hardy Hibiscus are truly giant in size, up to 12" in diameter. Originally, only limited colors were available. Recently, more shades and types have been developed. The leaves of most hardy Hibiscus plants are heart-shaped and a dull green color. Some have reddish, dark foliage. The bulbs can be as long as four inches.
The hardy Hibiscus is easy to grow and is a good survivor of winter. It can be successfully planted in Zone 5, and with additional protection in Zones 3 and 4 as well. By the end of fall, they die out. If the dead branches are weeded out, fresh shoots come up in spring. These develop fast and produce spectacular blooms. The new types are more compact and are normally smaller than the original shrubs. Some of the more popular varieties are Kopper King, Fireball and Blue River II.
It is better to plant hardy Hibiscus in an area where sunlight is available for at least six to eight hours a day, preferably early in the season. The plant will grow in most types of soil. Slightly acidic soil is ideal. Until it stabilizes, regular watering is required. The plant can be grown using cuttings or seeds, although only a handful of varieties are grown from seeds. The germination time is about two to four weeks. Both seeds and cuttings are available in the market.
Plant the hardy Hibiscus at the edge of the garden. It will tower over the other plants and provide a fascinating background.
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