Leaf drop. Whadda ya mean Texas has no humidity? 76* @ 4am and 84% as far north as Dallas. Not enough light!!! Must be outdoors. 60* is freezing for a lemon tree. There is citrus soil as well as citrus fertilizer, but the acid fertilizers for dogwoods and rhododendrons do fine. Don't be upset if you see no roots, mine has thrived for 7 yrs and I swear doesn't have a single new root. Moisture on a citrus can cause black soot fungus. Is there nowhere you can reintroduce it to sunshine? And fresh air?
