Birch trees have both male and female flowers on the same tree that form catkins when mature. The seed is produced in the female (pistillate) catkins, which begin dropping seed in late summer.
The birch tree sheds its seeds during the late spring to early autumn months, depending on the species. Birch trees produce large quantities of seed. ... yields approximately 375,000 seeds per lb., according to the United States Department of Agriculture.
This tree grows at a medium to fast rate, with height increases of anywhere from 13" to more than 24" per year.
To stratify indoors, mix the seed with a moistened, sterile, peat based growing medium in a container, wrap in a ventilated bag, and place it in a refrigerator for 12 to 20 weeks. In the spring plant the seed in a sheltered spot outside to grow into seedlings. Transplant to permanent site when well rooted.. . . . .364011236568!]0000000000000009783314147147!]
