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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 cork, phloem, cambium, and xylem.
• The xylem of a tree carries water from the roots to the leaves.

	News
	Warning: Check Tree-care Credentials Several autumn fatalities linked to dangerous tree care practices are prompting a coalition of arborists and urban foresters to urge contractors (and others) to hire only certified tree-care professionals. MORE >> Best Trees For The Street Scientist John Hammond of the Agricultural Research Service (ARS), the U.S. Department of Agriculture’s chief scientific research agency, has announced the findings of a four-year project to determine the best trees to use in urban spaces. MORE >> Bradford Pears Not Kind to Cities This tree species has weak branch connections and limbs are prone to falling down. MORE >> Selling Houses By the Yard Worried home owners hope landscaping adds value- from the Wall Street Journal MORE >> 2007 Tree of the Year Baldcypress named tree of the year by Society of Municipal Arborists (SMA) MORE >> 17-year Cicadas Threaten Midwest The 17-year cicada (Magicicada septendecim) wreaked havoc across the Midwest in 1990. Now landscaping experts worry about that generation’s offspring descending like a plague this spring. MORE >> NADF Hardiness Zone Map Find out the right tree to plant where you live MORE >>

"The best time to plant a tree is twenty years ago. The second best time is now."

	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 >>