The river birch is a popular tree for river banks and wet parts of the garden. Learn more river birch tree facts and how to use them in the landscape of your home right here. Its attractive bark is especially striking in the winter when the rest of the tree is bare. I've tried to research what the problem might be, but there seem to be a number of potential reasons. Q: My river birch tree has dropped long worm-like seeds, then whirlybird things. A healthy River Birch can live up to 50 years. Has nothing to do with the coming winter, for example. As the tree gets older, the red bark will darken and eventually turn grey. The numerous winged seeds mature in late spring (unlike all other birches which produce seed in the fall), packed between the bracts of the female catkins. Seed dormancy: River birch seeds are non-dormant if germinated under long days (light for >16 hours). In order to germinate in the dark, seeds need to be stratified for 60 days. Now it's dropping small yellow-like things for 3 weeks now. Plant a river birch tree in spring or fall when the soil is moist and the temperatures are cool. It does point to conditions the trees experienced in the last year or so. Every seed will germinate and they are easy to grow. This is a fast-growing tree that averages about 36 inches of growth per year. River birch trees bear male and female flowers on the same plant. Each year about this time they start dropping leaves and this continues until fall. Thank you for the question. The seeds are the largest of all birches native to the U.S. It’s not a predictor, if that’s what you’re wondering. I have several river birch trees planted near each other. Heavy seed production occurs almost every year. There are many factors to the longevity of your birch, which you can find on just about any garden site. The leaves make a mess of the yard all summer. Most will reach a Minimum of 20 years. 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