Fun Facts About Trees
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Tree Biology

  • Trees are the longest living organisms on earth.
  • Trees and other plants make their food through a process called photosynthesis.
  • The inside of a tree is made of phloem, cambium, and xylem.
  • The xylem of a tree carries water from the roots to the leaves.
News

Nominate a True Professsional of Arboriculture

ISA Announces search for the 2010 True Professionals of Arboriculture

Do you know a tree care provider who is a true professional of arboriculture? If so, you are encouraged to nominate them for the ISA True Professionals of Arboriculture Recognition award.

MORE >>

National Register of Big Trees
Big trees are symbols of all the good work trees do for the quality of the environment-and our quality of life. MORE >>

Green Spaces Improve Health
(BBC News) There is more evidence that living near a 'green space' has health benefits. MORE >>

Why Leaves Really Fall Off Trees
(From NPR)– You think you know why leaves fall off trees. Well, you're wrong. It's not the wind. It's not the cold. MORE >>

National Tree Benefits Calculator
The Tree Benefit Calculator allows anyone to make a simple estimation of the benefits individual street-side trees provide. This tool is based on i-Tree’s street tree assessment tool called STRATUM. With inputs of location, species and tree size, users will get an understanding of the environmental and economic value trees provide on an annual basis. The Tree Benefit Calculator is intended to be simple and accessible. As such, this tool should be considered a starting point for understanding trees’ value in the community, rather than a scientific accounting of precise values. For more detailed information on urban and community forest assessments, visit the i-Tree website. MORE >>

USDA Newsroom
USDA's collection of "hot topic" press releases ranging from current pest alerts for specific regions of the United States to new trends in disease prevention and tree and plant care. MORE >>


"I think that I shall never see / A poem lovely as a tree." - Joyce Kilmer, "Trees," 1914

Resources

Introduction to Arboricutlure: Tree Biology DVD

Available through the ISA Web store

The Top 10 Myths of Tree Care
Should you prune your trees in the Spring? How deep must fertilizer be applied to reach the roots of your trees? Which species of trees should be topped to keep them from falling on your house? MORE >>
© International Society of Arboriculture 2009
P.O. Box 3129, Champaign, IL 61826
Email comments & questions to isa@isa-arbor.com