Taz_nut's Inbox

Ian your Arum Lily is suffering from disease, Phytophtora Richardiae, root rot.
The only way for you to save any parts of your plant is to take it out of the pot, scrub off any diseased parts, repot in clean soil any part of the corms left after washing in a solution of Jeyes fluid.

One point to add to spritz's instructions - arum lilies come from South Africa where winters are drier than ours. Reduce the watering over winter and start to increase it again in spring as growth restarts

Ian, its natural instinct is to 'hibernate' for the winter and then to return to life in the spring. It just isn't a house plant, as the others have said.
So you have two choices - let the plant die back and keep it moist through the winter in the coolest place you have, then try to revive it in the spring, or find a friend with a garden who would plant it in the soil.

There are lots of lovely houseplants around to take its place. Why not go and let your wife choose a new (different) one!

Oh! poor Zantedeschia! she needs to be in a nice boggy area, my "Ethiopica crowborough" lives on the bank of my small pond and thrives. good luck!

Sorry to hear that. Arum lily likes it best being outside, they are an outside plant really, they do not mind the cold, they will die down completely every winter, but rises up every spring and if planted in a moist condition will multiply itself.