Posted: 05/11/2017 at 18:34
Not quite sure what you mean by a "miniature" orange tree. Do you have the variety name ?
Citrus are not known for being House plants whatever the GCentres may like to tell you. Judging by the size of the trunk, your Citrus is certainly a viable plant.
The compost you have it potted in looks very fibrous - think of where Citrus grow naturally and the climate and adjust your aspect and potting medium accordingly. Make sure you haven't over potted too - nothing worse than a small root system in a lot of damp, claggy compost.
In the UK, they will drop their leaves to an extent - particularly if kept outside or in a cold GH but if protected from the worst frosts, they will begin to leaf up once the warmer weather starts.