I think they are growing them in Japan in a controlled environment. Have been working with black morels for years they are the easiest to cultivate. I have many beds growing in forest edge settings around my house. It isn't that hard to set these beds up. Haven't had as much luck with the true yellows they tend to be more symbiotic to certain trees. The blacks will grow with a nutrient rich soil blend right next to a low nutrient rich soil blend.