I purchased a Meyer lemon tree last June. While outside, the tree flourished. I live in zone 5, so I brought the tree inside this October. It had since been dropping leaves at a steady rate; it finally shed all its leaves this week, including perfectly healthy green leaves. I am left with a few randomly sized green lemons. I purchased two grow lights to supplement its requirements, have a humidifier (in addition to misting the plant daily manually), and use the same fertilizer (Jobe's organic) that I used while the tree was outside. The tree is only given water when the soil dries to two inches in depth. I also recently purchased a root warmer hoping that would bring it back to life; this far it has not. Thank you in advance.