urban forest initiative tree week 2020 biology of autumn



As we experience the glory of trees and forests in autum, as trees explode into color, we take an opportunity to talk about what trees are doing at this time of year. Autumn colors and the fall of leaves is not a passive response of trees to changes in weather. Instead, trees are engaging in a highly active sequence of behaviors that serve to conserve nutrients and prepare trees for the chill of winter. Trees expend considerable energy to move nutrients, especially N, from the leaves into the stems and roots. Fall colors are a physiologic response to this preparation. Below ground, roots are in a period of active growth even as growth in the crown ceases. We will discuss the modern understanding of all the events taking place in trees as they prepare for winter.


Date & Time

Wednesday, Oct. 14, 2020 @ 7:00 PM to 8:30 PM




Tickets are free, but required. Register at https://kimmerer.com/online/ under "Biology of Autumn". 



Tom Kimmerer @ tom@kimmerer.com