| Index to chart topics |
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The three fields for describing the colors of leaves and flowers use the Royal Horticultural Society�s color numbering system.
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The twelve soil textures used in The Compleat Botanica come from the Bienz Soil Chart published by the United States Department of Agriculture.
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The United States Department of Agriculture�s plant hardiness zones were originally developed in 1960 with the assistance of the American Horticultural Society.
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