Birch

The birch tree is a species of deciduous tree in the genus Betula, native to Europe and Northern Asia. It is closely related to the alder (Alnus) and hazelnut (Corylus). The bark of birch trees contains tannins, which are astringent in nature and give birch its distinctive smell. The leaves are alternate and spirally arranged on the twigs; they are typically triangular-shaped with serrated edges. Birch flowers are small, white or pale yellowish-green at first with male flowers having six stamens while female flowers have none or just two stamens—which makes them sterile so no pollen can be produced from them; instead female flowers produce fruit called samaras which contain one seed each inside them; when ripe these samaras fall off bark trees where they germinate into saplings (usually 7-10 years old). In some species such as Acer campestre only males have empty arches aka "vessels" through which insects may deposit pollen onto female flowers' surfaces but these same species do not usually flower every year since their flowering period only lasts about 4 months long due to cold weather conditions preventing bud formation due to low temperatures during this time period leading up until mid March when temperatures rise above freezing again allowing buds formed earlier than usual begin opening resulting in flowering season starting again starting around 1st week May though depending on weather conditions sometimes earliest opening day may occur 1st week April itself too if all goes well without any bad storms happening too early spring when days start getting longer again until summer ends sometime around mid September thus ending most productive growing season altogether once there's no more cold weather coming anymore during this whole month long process every year except maybe once every three years here maybe two then maybe once every five years still depending on what kind of climate zone area you live in.