You should contact your local Humane Society, or vet's office.  I was able
to pick up a brochure on poison houseplants at the Humane Society, but once
again, ferrets generally prefer the dirt.  If you are concerned move the
plants so there is no possible way for the ferrets to reach them.  Plants
are more of a concern with animals who will eat them like cats, birds and
possibly dogs.  If in doubt Remove and Research.  Good Luck.
 
Lara
[Posted in FML issue 2457]