Wasabi is native to Japan and is a semi aquatic perennial with long stemmed, heart shaped leaves. Its inflorescences of white cruciform leaves reach 40cm. There are a number of varieties, but all form thick, knobbly rhizomes.
Grow the plants in very clean cool, slightly acidic alkaline running water, with plenty of shade. The temperature should be between 10° Celsius and 13° Celsius. Propagate from offsets of the rhizome. Keep the plant well shaded, cool and watered.
This plant in paste form is served with sushi, sashimi, soba noodles and other Japanese dishes.
information sourced from The Complete Book of Herbs