Why does the outer edge of the leaf get yellow?

Question

It is an elephant ear plant.

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Answer 1

This appears to be Phyllosticta leaf spot. It is quite common. Treatment will be a fungicide. There are several that you can choose from. This article will help: https://www.gardeningknowhow.com/garden-how-to/info/using-fungicides-in-garden.htm

This article will help you to diagnose common issues with elephant ear plants: https://www.gardeningknowhow.com/ornamental/bulbs/elephant-ear/elephant-ear-plant-diseases.htm

This article will help you to grow them: https://www.gardeningknowhow.com/ornamental/bulbs/elephant-ear/growing-elephant-ear-plants.htm