Horseradish

Horseradish (Armoracia rusticana) is an indestructible classic that practically grows by itself — the only thing to keep an eye on is its urge to spread. Any piece of root left in the ground becomes a new plant, so a contained bed or a large tub is well worth it. Plant it in early spring from root cuttings (thongs) laid at an angle in the soil. The hottest, best-quality roots — the makings of a proper horseradish sauce — are dug once the foliage dies down from October onwards; store them in damp sand in the cellar.