Seeds of the River Birch Tree
The River Birch is widely distributed across the United States, and it grows well in a wide variety of climates. It is most common in the Southeast, where the frost-free season lasts for 210 to 270 days and annual rainfall averages 1270 mm (50 in). In the north, where annual rainfall is much lower at less than 760 mm (30 in), the frost-free season lasts only 150 days. Embryos The birch tree produces both male and female flowers, called catkins. The female catkins are smaller than the male ones. They form in the fall and mature in the spring to release pollen. The pollen is wind pollinated and is shed soon after release. The female catkins grow on spur-shoots and are produced with leaves. Leaves The River Birch Tree is a hardy native. However, its foliage can show signs of disease or pest attack. These symptoms are caused by a specific type of Aphid that affects the leaves. These infections do not cause any serious damage to the tree and can be easily treated with a few simple steps