What\'s happening to my Elephant Ears?

Toms River, NJ(Zone 7a)

This season I purchased Illustris - Elephant's Ear - Colocasia esculenta from Proven Winners' website. They always have the best plants and I don't know why I'm having a problem. I can't seem to figure out what is causing the leaf curling and browning and subsequent dying. All of the other plants in the planter seem to be doing fine. I can't seem to find any info on this type of problem with elephant ears. Are they more susceptible to a bacteria or fungal infection than the other plants. Can anyone help me???

Thumbnail by DeanSwishhh Thumbnail by DeanSwishhh
Powder Springs, GA(Zone 7b)

Not enough moisture I'd suspect. I would put them in another pot and sink them into a small pond of water to ensure they stay constantly wet (during summer). This is for Colocasia only, not Alocasia that likes to dry out some between watering.

Cleveland,GA/Atlanta, GA(Zone 7b)

Also, could be sensitive to mineral salts. Does the pot drain? How often do you fertize? Do you have hard water?

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