A few years ago I made the mistake of planting black bamboo. However, I have found the secret of controlling its spread- eat it! So I am now at the peak of my bamboo season, eating sauteed, stir-fried, etc bamboo a few times a week. But I've always wondered....what is it in bamboo that gives that weird mouth feel? I can't eat it raw because of that feeling...not quite metallic, not quite astringent....just weird and hard to describe. I still get the feeling from cooked bamboo, but not as severe, although one of my son's still finds it too strong to enjoy. It's the only problem with what is otherwise an ideal vegetable.