Q.What causes calla lily leaves to turn yellow?
My calla lily plants are in containers in a sunny window in the AM and a shaded window in the PM. I use a water meter to make sure that they are not over watered but kept moist. No matter what I do, they are turning yellow and dying. What can I do not to lose them?
It can be difficult for the indoor Calla Lily to receive enough light. Could you set the pot outdoors to receive more sunlight?
Yellowing leaves generally indicate a watering issue. Either to much or to little. Since your watching the watering carefully, I also would suggest you check to make sure the pot is draining adequately. Make sure the water is not pooling around the roots causing root rot.
Here are some links that may help pinpoint the issue.