Here is a brief, helpful blurb about wasabi I found on a Chicago Tribune sponsored nutritional site a while back…
Wasabi offers potent flavor and nutrition
Q. Where does wasabi come from and is it good for you?
A. With nutrient potential as powerful as its flavor, wasabi is another food entering the nutrition spotlight. Wasabi is a member of the Cruciferaceae or Brassicaceae family, which also includes mustard, horseradish, broccoli, Brussels sprouts, cauliflower and cabbage.
While it grows wild along the beds of the river valleys of Japan, wasabi is also cultivated in the Pacific Northwest of the U.S. and Canada. After its second year of growth, the wasabi plant is hand-harvested in the spring or fall for its large root. The root is usually ground or grated into a fresh paste and most commonly paired with Japanese cuisine, such as sushi or sashimi (raw fish.) The leaves, sharing the same spicy flavor as the root, can also be cooked or used as a garnish.
Feel good and keep smiling! Pat