I have elephant ears and Vinca planted in the same pot. The Vinca is doing great; however, has a brown fuzzy material on the leaves and vines. I don't see any bugs, wasn't sure what this was and how to treat with at home remedies or with sprays from local gardening center. Also, as you can see in the picture my elephant ears are not doing that well this week either. I'm not sure if I'm under watering them or if this same brown fuzzy stuff has affected them as well. It seems in the middle of the leaves there is something coming up but too soon to tell.
Elephant Ears Wilting/Browning on Vinca Plant
Certified GKH Gardening Expert
We did not receive an image.
The soil in your Elephant Ear container should be kept moist, but never soggy. Container plants will need daily water and even twice a day if the temperatures are above 80 degrees.
Here are some links to refresh you on the care requirements.
I cannot determine what the brown fuzzy material is that you mention, but if you suspect a fungus or pest, you can treat the plants with Neem Oil.