A fast-growing birch (up to 3 feet per year) with exfoliating cinnamon to brown bark. Best planted in groups on wet to moist soil with pH of 6.5. As birch is very drought-sensitive, you might try planting it near a downspout. Can be single or multi-stem. Requi ... res full sun. High and dry soils with high pH will kill this tree. On the Kankakee River, River Birch sits in water for over a month or two.