Wasabia japonica 'Midori Utogi' is cultivated for its rhizomes, which, when grated, produce a milder version of the traditional wasabi species paste used with sushi. Despite its reputation as tricky to grow, it thrives in the UK's temperate climate, particularly in cool, shaded spots with plenty of humidity. This variety, from the Brassicaceae family, also offers edible leaves and flowers with a fresh, peppery flavour, perfect for salads and tempura. 'Midori Utogi' tolerates temperatures down to -5°C, shedding its leaves in winter and producing clusters of fragrant white flowers in early spring. Ideal for growing near ponds or in containers out of direct sunlight.