The Betula pendula produces millions of seeds from each tree every year. Each year about this time they start dropping leaves and this continues until fall. The male flowers (catkins) form in summer and overwinter. I've tried to research what the problem might be, but there seem to be a number of potential reasons. In order to germinate in the dark, seeds need to be stratified for 60 days. A healthy River Birch can live up to 50 years. Thank you for the question. Has nothing to do with the coming winter, for example. The leaves make a mess of the yard all summer. As the tree gets older, the red bark will darken and eventually turn grey. It looks like it's snowing. River birch trees bear male and female flowers on the same plant. River birches are not particularly long-lived trees, however. Learn more river birch tree facts and how to use them in the landscape of your home right here. Seeds are shed in late spring and early summer. In spring female flowers emerge, the catkins elongate and pollination takes place. Most will reach a Minimum of 20 years. Q: My river birch tree has dropped long worm-like seeds, then whirlybird things. Its attractive bark is especially striking in the winter when the rest of the tree is bare. I have several river birch trees planted near each other. Now it's dropping small yellow-like things for 3 weeks now. 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. The seeds are the largest of all birches native to the U.S. River birch seeds. Seed dormancy: River birch seeds are non-dormant if germinated under long days (light for >16 hours). They grow very quickly so … Every seed will germinate and they are easy to grow. I have to constantly sweep them off my porches and my driveway is a mess! Heavy seed production occurs almost every year. 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