Threadleaf Arborvitae getting brown on the interior
This Threadleaf Arborvitae has been perfectly healthy for 3-4 years now, and looked good through the summer. But now I'm noticing some browning, mostly in the interior of the plant.
It can't be from lack of water, because there's been an abundance of that in the past month here in Pennsylvania.
Could it be from a lack of nutrients? I gave it some food in the spring, but I never gave it a fall feeding (plus those flowers are right there). For this type of plant, is there a particular deficiency that can cause browning? Nitrogen, Phosphorous, or whatever?
Plus another question -- is the plant too far gone, or can I definitely bring it back?
Here is a link that might be useful: