My BIL added soil acidifier with his usual fets, and his plants are so green, they look bluish. The soil acidifier is advertised to turn hydrangeas blue. I guess it works on other stuff too.
I grew a Kosher Tangie outdoors about 4-5 years ago but the leaves on mine were much narrower than on your plant. The buds were kind of thin and sparse compared to my other plants that year, but the buzz was excellent, very upbeat and happy.