Horseradish is adapted to the north and is not suited for southern planting except in high altitudes. Plant horseradish in the spring, after the ground warms to about 50° F. Select a sunny site in an area that has rich, well-drained soil, and till the soil to a depth of about 12". Plant in a 6 to 8" furrow, spacing plants about 12 to 18" apart, with the flat, cut end facing up. Fertilize horseradish plants generously with compost, manure or garden fertilizer. Allow the roots to develop by not harvesting the first season. Horseradish makes its best growth in the cool autumn, steadily improving after September, and not injured by early frost. Roots can be harvested after the first killing frost in late fall, or in early spring before new growth begins. Roots become hotter with age. Lift horseradish plants and roots with spading fork. Wash off roots and store in a clean, plastic bag in the refrigerator. Bohemian horseradish has narrower, smoother leaves, and better disease/pest resistance than common horseradish. Hardiness zones 3-9.
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