Kokinsai Satsuki Azalea Reddish/Brown Foliage
I bought a small Kokinsai Satsuki Azalea cutting (apx 2 yrs old) from a local bonsai lady. From what I can find about this cultivar it is an evergreen shrub. If I understand correctly, that means it should have green foliage all year long but the leaves of my plant are all a sort of reddish brown color, at least around the outsides of the leaves. It has been this color, on the whole plant, since I got it at the beginning of May about 5 weeks ago. The foliage is sparse but the leaves are not curling or falling off and there are no spots or holes or yellowing or any other symptoms that I have read about. It is in a bonsai training pot apx 6" with a well-draining bonsai mix. I water it with distilled water with apx 1 mL of vinegar to lower the pH of our water (which is apx 7.4). I have not fertilized yet as I have not seen anything that would resemble vigorous growth. The plant is in dappled sun (from a big tree) with 2-4 hours of morning sun. I am in Chico, CA USDA zone 9b.
Any help or input would be greatly appreciated!