Naturally Great Fall Color By Dan Hinkley, special to HGTV.com
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Although any garden worth its salt does not acknowledge an end to the gardening calendar--instead, encourages the transition from one season to another--to most people, the colors of autumn represent a sense of closure. Fortunately for the North American gardener, our native flora signs off with magnificent bravado--quite unlike anywhere else on earth.The colors of autumn are, if distilled to the most simplistic of principles, nothing more than stored sunshine released at year's end in a superlative seasonal flash. The varied pigments responsible for brilliant reds, purples, corals and yellows have been constructed and stored through photosynthesis throughout the year. During the growing season, they're masked by the most dominant pigment in the plant kingdom--chlorophyll. As temperatures drop and days shorten in autumn, the greens of this governing pigment disintegrate and the spectacle begins. What plants are the most reliable fall performers? It depends. First, not every seedling of every plant species is identical--in other words, genetics matter. (This comes as no surprise to anyone who has raised more than one child.) Where you have placed the plant in your garden also influences the development of color. Remember the stored sunshine reference? The sunnier locations will most often translate to better color development. For the same reason, each year will have its individual vintage depending on the temperature, sunlight and rainfall patterns of the previous summers. Nearby high-intensity street lights can also affect color. Taking these factors into consideration, you can still assume an entertaining performance from numerous species native to our continent. Here's a partial list:
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 The fall hues of 'Sandra' witch hazel vary from yellow to coral to reddish orange. -- photo by Michael A. Dirr
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Vernal witch hazel (Hamamelis vernalis)The witch hazels of our continent received their common name from water diviners of the 17th century. Arriving on our shores in need of a new source of divining wood (hazelnut, Corylus, had been traditionally used in Europe), the diviners decided that Hamamelis, whose leaves are similar in appearance to the Eurpoean hazelnut, filled the niche. When compared to its Asiatic cousins, the flowers of the American species pale; the spidery yellow to reddish flowers are later than the species (late winter). The multistemmed tree or large shrub, however, is unparalleled in its end-of-season finery, alighting in shades of burgundy, copper and coral.
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 Grown in the sun, oakleaf hydrangea produces beautiful fall foliage. --photo by Michael A. Dirr
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Oakleaf hydrangea (Hydrangea quercifolia)The oakleaf hydrangea has a particularly large following throughout much of the U.S. due to its large, lobed, highly textural leaves and sensational mid- to-late summer blossoms of ivory white. There are many good selections, some with very large flower heads, including 'Snow Queen' and 'Harmony' and even one with fully double flowers, 'Snowflake'. If grown in shade, the foliage will generally not color well. If cultivated in full sun, however, be prepared for a superb performance--glossy shades of burgundy and red appearing in mid autumn and staying effective for many weeks. Though popular gardening literature recommends this species be treated as a woodland plant, if it can be provided even moisture throughout the year in a bright sunny location, the autumn color will equal the entertainment value of its flowering season. --Author of The Explorer's Garden: Rare and Unusual Perennials, noted plantsman Dan Hinkley is working on a book about trees and shrubs. He writes frequently for American Gardener, Horticulture, The Gardener and Martha Stewart Living, among other publications.
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