The essential accompaniment to roast beef - nothing beats the bite of your own freshly grated horseradish root. Horseradish is a vigorous perennial herb that will return year after year for an increasing supply of hot, tangy roots. These thongs are quick to establish and easy to grow, requiring little aftercare. When planted in ideal conditions, horseradish plants may become invasive, but can grown in a container to control its growth and restrict its spread. Height: 60cm (24"). Spread: 45cm (18").