Posted: 07/02/2014 at 12:14
It looks like it is in a conservatory but the photo looks dark. All citrus trees grown in pots thrive on a balance of three things: bright light, consistent moisture and good drainage. They need eight hours of direct sun per day. You can get away with six, especially during the winter off-season, but bright light is required.
Are there any buds or leaves dropping off?