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Edible plants that come back year after year save planting time, and maintenance is usually limited to annual weeding, fertilizing and mulching. Asparagus and rhubarb thrive where winters are cold, sorrel is a terrific perennial salad green, Jerusalem artichokes and horseradish grow almost anywhere, and gardeners in climates with mild winters can grow bunching onions or even bamboo shoots as perennial garden crops.
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