I was given 2 bulbs for black elephant ears.
When they sprouted, they look the same as the rest of my elephant ears. Is this common, will they turn black/
Certified GKH Gardening Expert
This is very common with black, or dark purple plants. My sweet potato leaves start out green as well, turning black as they mature.
This article will help you to grow elephant ear plants: https://www.gardeningknowhow.com/ornamental/bulbs/elephant-ear/growing-elephant-ear-plants.htm