Overwintering and leaf drop.
It's too cold here for perennial impatiens to survive the winter, so I have to bring them indoors. They do alright but there's lots of leaf yellowing and drop, I'm assuming from lowered light. In the summer, I move it back outdoors, and pinch off whatever branches are getting too bare and leggy and not leafing back up. Is there anything I can do to keep it looking better indoors, or to reduce the risk of it going too much into decline?
Some notes: Humidity is pretty high. They probably get a bit colder than they'd like as I have to keep them next to a window for the light, although it's not really all that cold until January and February. I try to keep them a bit on the dryer side as they're not growing all that fast and I don't want any rot.