I have a 6 year old potted avocado tree. I keep it indoors in winter, outdoors in shade in summer. I live in zone 6. My tree has been having brown leave spots, and the tips are curling under and turning brown. Even some of unaffected green leaves are turning under and curling up. I water 1x per week. The tree is about 11 ft. tall. I would hate to lose my tree, but I don't understand why the brown leaf tips. Any help is greatly appreciated.
