New York times  article on increasing the urban tree canopy:

Here is some information on the new second edition of Viereck and Little’s Alaska Trees and Shrubs :


A link to a Guide to Birch Trees, from the University of Saskatchewan Extension Service:

Here is a link to the Common Tree Diseases of British Columbia, an online guide to forest tree disease from the Canadian Forest Service:

Here are  articles on tree fertilization from Michigan State  and Cornell University Extension Services:

A brief  article about insect infestation and aspen decline in Colorado:

Here are two brief articles on salt damage to landscape plants:

In case you missed the January Newsletter, here is a tree profile by Chris Mertl:


New York city has begun work to save the genetic material of historic old trees, including one that it is said George Washington walked under.