Birchsweet (betula lenta) The Birch tree is a graceful tree about 25m high, which has a pyramidal shape while young. It has bright green leaves and a dark reddish-brown aromatic bark, which his broken into plates or patches. Native to southern Canada and southeastern USA; it now grows also in Russia and parts of Eastern Europe. Birchsweet helps to keep the skin clean and pure, making it an effective anti-odourant.