I know Oranger, you BARELY have enough time to set the pentagram before the black mist gets you, but it is feasable. Don`t give up. Just make absolutely sure the holly is on top. Besides, each plant has its set position and won`t work any place else.
It worked!

There will never be such other game like the Lost Crown! It's a masterpiece! I walk this quest through little by little, because I don't want to finish it too soon.