Wasabi is the hardest plant we've ever tried to grow. To this day, we've never had a successful crop! Part of that is trying to grow a cool temperature, shade-loving plant in San Diego, Zone 10b. This plant LOVES temperatures between 45-70°F, hates direct sunlight, and is a member of the cabbage family. It's so tough to grow that most of the "wasabi" you buy at the grocery store or eat at restaurants is actually a combination of horseradish, chinese mustard, food dye and other ingredients. If yo