Clethra leaves turning brown
I planted a Ruby Spice Clethra this past spring. It leafed out and bloomed nicely this summer but now I am noticing that about 75% of the leaves are browning from the tips. This does not appear to be a normal fall leaf color change as I understand these turn yellow, not brown, in fall and our leaves are several weeks away from changing.
It gets part sun and a lot of water. It has received some general purpose granular fertilizer every month or so. I have not noticed any bugs on it other than bees and wasps.