I purchased a 7 foot emerald green arborvitae about 4 months ago and planted it in my flowers bed. i watered i used manure compost mixed with the soil in the flower bed as I always do. I only water if we don't get rain for a few days and around here it rains almost daily in the afternoons. So today I noticed a brown area about mid ways down on the outside of the plant. It's about as large as a dinner plate. Any idea what's up?? I paid 130.00 for this tree and really would Like to save it.
