Greg Martin wrote:Not sure if this one is closely related or not, but Baker Creek has a pink flowered buckwheat that they list as perennial: Rose Red Soba
It's certainly beautiful and as I post this they still have it in stock.

Just WOW! Looks like a must-try.
Haven't seen any listings for availability within the EU yet :(
I'll be avidly following updates from your growing trials!
"I live on Earth at present, and I don't know what I am.I know that I am not a category.I am not a thing—a noun.I seem to be a verb, an evolutionary process—an integral function of the universe."
Buckminster Fuller