this post was submitted on 05 Dec 2023
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It used to be that real wasabi only grew in Japan, though they started growing it in England and Iceland some years ago, so availability may improve. Though with its short shelf life, the stuff you get outside of specialist grocers and high-end restaurants will be a cheaper and hardier variety of horseradish.
It seems like it's being grown in a lot of places now. Many people in this thread have mentioned Oregon (USA), and I know it's also being grown in Tasmania (Australia).
There's one location on the Oregon coast that grows it in small quantities. They serve it at Zilla Sake in Portland.