Like coniferous trees, broadleaf trees also reproduce by producing seeds. First, the tree's inflorescence needs to be pollinated. The birch tree's staminate catkin releases pollen, which is distributed almost everywhere with the help of the wind.

Some of the pollen reaches the pistillate flowers of other birch trees. When this occurs, the pollen fertilizes the flower, and the seed begins to develop. During the autumn, the seeds fall into the ground.

Birch trees grow their staminate catkins and pistillate flowers during the spring, at the same time as the trees grow their new leaves.