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5/02/2007

Evergreens turn red due to drought

Minnesota, USA
Image: The Norway pine, also called the red pine because of its reddish brown bark, stands 60 to 100 feet tall, with a trunk three to five feet wide. Its needles are four to six inches long and grow in pairs. The tallest Norway pine in Minnesota is in Itasca State Park. It is over 300 years old and stands 120 feet high.

May 01, 2007
Conifer tress should be evergreen, but across northeastern Minnesota many have rusty-orange or red needles instead. The problem is called winter injury and is widespread this spring because of harsh winter conditions and the region's recent drought. Although the needles look bad, the trees and limbs are probably still alive and most of the trees will make it. It has affected many evergreens, including red pine forests and arbor vitae bushes in yards.

FYI

Environmental Disorders of Woody Plants
The five most common temperature and moisture related problems in woody plants are sunscald, drought injuries, drowning of roots, frost damage and winter (cold) damage.
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