My lemon tree has been barley alive for a few years. I almost killed it when I was a new plant mom. I let it hibernate in my basement (55-65 degrees) over the winter. When spring came it got new buds and even 2 flowers. But now it is just barely hanging in there. I have been giving it citrus fertilizer. Watering when the top soil is slightly damp. Any advice? Is it hopeless??