Better safe than sorry, I guess. I recently tried foraging bamboo shoots, inspired by @samstonehill and @clareartista but the bamboo that I had foraged, tasted so extremely bitter, even after cooking it for an hour and 15 minutes and having rinsed it twice, then marinaded and fried it, that I decided to spit it out and throw away the rest of it. I prefer not to poison myself, if I can help it. No matter how appealing it is to me to eat (more) natural food.