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Hi John, Horseradish is aHi John, Horseradish is a perennial and usually planted as root cuttings. Plant in a container or in a spot where they won't be disturbed, possibly in the border of the garden. Horseradish needs little or no attention in order to thrive. It likes a sunny spot and water once a week during dry spells. You can harvest horseradish one year after planting.