Irish Botanica Chaga Mushroom (Inonotus Obliquus) typically grows on the outside of birch trees. Irish Botanica Chaga Mushroom (Inonotus Obliquus) typically grows on the outside of birch trees in very cold climates such as Siberia, northern Canada, Alaska, and some northern areas of the continental United States. At Irish Botanica, we keep things simple; by choosing suppliers who share our faith in the natural process, suppliers who do as little as possible with the raw ingredients so they stay pure and potent. We test rigorously to ensure the final product is as wonderful as the plants and herbs we began with. At Irish Botanica we simply package and deliver natural goodness.