River Birch typically grow to a height of 40 to 70 feet tall but can reach up to 90 feet. These trees are known for their copper-colored peeling bark which provides interest in all seasons. Squirrels love to munch on the drooping clusters of seeds produced in the spring. The seeds ripen in May and June which coincides with high water levels of rivers. Since the trees naturally grow along riverbanks, the seed is carried long distances by the water. Once left on the mud along the banks, the seeds germinate quickly to produce stands of trees key in helping to prevent erosion. The hard wood of the River Birch has been used to make ox yokes, wooden shoes, and furniture. Behind the distinctive curly bark of the River Birch lies a sap that at one time was boiled by indigenous people to make a sweetener similar to syrup.