A Forest Flame is one of the type of flames of the Dying Will Flames of the Earth.
Forest Flames are shaped like countless leaves forming sharp edges. Forest Flames allow the manipulation of plants. Its user can grow, manipulate, and use all sorts of forest-born vegetation to a certain level.
The Flame also has the sharpness of a blade, comparable to small, but very sharp knives. This was shown when Ryohei Sasagawa was knocked back by the leaves, severely wounded by cuts inflicted by the Flame.