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How to grow horseradish
Obtain horseradish crowns or roots to plant.
Purchase a cutting of horseradish from a greenhouse or grocery store. Most of the time, these places will sell crowns (the uppermost part of the plant) or roots that are pre-cut and ready to plant.
Most gardeners start horseradish from crowns, as the plant grows from the roots and only its weed-like flowers produce seeds. Like carrots or potatoes, horseradish roots are ready to go straight into the ground.