Answer: It is difficult to grow evergreens successfully in a container under home conditions. Browning with dropping needles is usually not a good sign. Depending on what kind of tree it is, it could indicate a pest problem such as mites (common on dwarf Alberta spruce) or it could indicate a variety of different problems such as over watering or under watering, poorly drained soil, or even simply accumulated stress. At this point the best you can do is keep the soil slightly damp any time it is not frozen, protect it from winter winds, and move it to a location where it is not up against a building or next to pavement which would reflect heat onto it. You might also want to consult with your local county extension and see if they can give you a more specific diagnosis of the problem. Good luck with your little tree!
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