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Brown inside

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From: Sharon LLOYD
Howell, MI
I have a row of arborvitae trees with new growth and green on the outside. What would cause the inside of trees to turn very brown?

Extension Message
From: Richard Hentschel
Extension Educator, Horticulture
DuPage/Kane/Kendall Unit
all needle evergreens will shed interior needles every year as part of their normal cycle. the new outer needles are more productive recieving more sunlight than those inside. At some point each year, remaining energy is moved out of needles to other parts of the plant and then they brown. Depending on annual growth rates, some years this can be very noticeable. Water during dry periods each summer and feeding in the spring will keep them healthier.

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