Notice to wait until the complete shedding of leaves from the tree of your ward, as it happens defoliation. Which branch are exempt from the first leaf: top or bottom? Is this true for any trees? By participating in the projects of the birch, we will not close our eyes to the other trees!
Scientists believe that the average time can be set to the date of purchase leaves in autumn coloring, leaf fall for a start ... But how quickly the tree defoliation strongly depends on the autumn. From the wind, from the rain, the air temperature ... But is that the only factors that affect the frequency of processes in the plant? Maybe urban trees that grow in the conditions of a strong light pollution has long been developed in violation of all the rhythms? Let's try to establish whether this is the beginning of the example birches growing in different natural or anthropogenic (ie man made) environment!