Ok, where does one get wasabi starts? Would they be happy in zone 8A deep south?
Try richters.com. There was a site called NC alternative plants (?) that had a lot of info. Not sure how they would do in your area.
I got my starts from a local grower, they were hand delivered. Wasabi requires cool weather, shade, running water and are tricky to grow. The stuff is $140/lb! for a reason. I have Ideal conditions, spring fed & tall evergreen trees. My (surviving) plants are starting there second season and seem to be doing better this year.
I lost a few plants to a flash flood from a heavy spring rain last year. I pick a leaf or two to eat fresh and they definetly have flavor this year. Last year not.