I went back and read your first post again, Arico. You said they grew like crazy then stopped at about 90cm. and my thought was - that's about as tall as you can expect them to be when fully grown.
I think those you have indoors are just taking a rest, and waiting for the spring weather to stimulate more growth and bloom. Any way you can put a couple of them out in your great little greenhouse to see if that helps the leaf color, and starts them putting out new leaves again? They can take a certain amount of cold at night, just not freezing or frost. Mine had lows down to 3deg. C in February and no signs of distress at all.
