HELLO,AM FROM NY,,WE HAVE SEVERAL LEMON TREES GROWING INDOORS..THE MAIN ONE CAME FROM A SEED AND PLANT CATALOG ,,IS A FEW YEARS OLD.AND WE HAVE SEVERAL BABIES FROM THAT..A FEW SEEMED TO HAVE GOTTEN BROWN AND LOST THE LEAVES,BUT ALSO I HAVE 3 AT MY HOME WHICH ARE ALIVE AND GREEN,BUT NOT REALLY GROWING A LOT OVER THE WINTER...I AM CURIOUS IF THIS IS NORMAL,OR HAVE THEY DIED??ANYTHING I CAN DO WOULD BE GREAT TO KEEP THEM THRIVING...

I have lemon tree, plus a lime tree and a large tree with inedible little oranges, all growing indoors. They're in pots a foot high & over a foot in diameter. None grow rapidly in winter. I water them thoroughly once a week. They get good light, with direct sun at least a couple hours a day. I feed them high phosphorous blend once every 6 weeks.
Once the tree with little sour oranges went unwatered, turned brown and shed its leaves. We watered it & put it in the sun - it's fully recovered. They were yellowing, so we gave them some iron ... seem better after, perhaps because of?
They spend the summer outside. - We're in NW CT, about the same conditions as Saugerties, which is less than an hour away. Hope this helps.
Good luck!