Hi Aski,
If you type the name in the OB search, you'll get several threads with lots of info on this plant. Also here's some stuff from iospe:
Ansellia africana
How have you been growing it? I don't have it since it's a huge plant, but what I've read about it follows what others have previously said in this thread. Being so far north, you should probably give it full southern sun outside when the temperature is ok, and behind a south window in the winter. You may even need supplemental light for it.
Also, since the plant is used to a dryish winter in its natural state, perhaps you need to reduce watering and fertilizer this winter?