HI,I WAS CURIOUS IF IT WAS OK TO PRUNE MY HUGE ARBORVITAE HEDGE IN MID AUGUST?USUALLY I DO IT IN MARCH OR APRIL,BUT DID'NT HAVE TIME THIS SEASON.MY NEIGHBOR RECENTLY PRUNED HIS,AND WHERE HE MADE HIS CUTS THE TREE IS NOW BROWN,LIKE IT GOT BURNED IN THE VALLEY HEAT...
Linn County Oregon
I agree with you. Wait. Sudden exposure to the sun as a result of major pruning at this time of year will shock the plant. It is not necessary. I recommend late winter, early spring hedging time.