I'm curious to see how things go here. The other year I bought wasabi seeds from Horizon. Gave some to a farmer friend and we both weren't able to sprout the seeds. To give the benefit of doubt to horizon there was a mesh cloth with the seeds that I believe had moisture. I waited about 2-3 weeks before I planted and was unsuccessful.
I also belong to a aquaponics forum where we had discussion on wasabi and people were able to buy the rhizome and try planting that. Some had some success in the beginning where leaves would appear but eventually the plant would die. These were all people living in Hawaii so we knew the risk that the weather was probably too hot to grow them. Thou I still hear rumor that there are people who succeeded. Probably living in the mountains.
I saw a show once where people in japan where growing some wasabi in a stream. If I remember right they placed the root in the stream and held it down by placing a rock on top of it. Don't remember if it was sunny or shaded.
Anyway good luck. If the Southern Cal folks have success I may try it again.
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