Elephant ears (Colocasia esculenta), also called taro, are majestic plants with large heart-shaped leaves that can reach a length of three feet and a width of two feet. This plant also self propagates and can become quite large, sometimes taking over a garden, especially in small spaces. In fact, an elephant ear's underground root structures (called corms) usually weighs one to two lbs., but can weigh as much as eight lbs. To get rid of elephant ears, you must get rid of its corm, which is easier to do when the soil is moist.
Cut down the plant to about an inch above the ground. Use large pruning shears for this job. You can now see where you are digging without a large plant in the way.
Dig around the perimeter of your plant, about two to four inches away from the crown. If you hit the corm, move further out. Dig about eight inches deep. Even though the top of elephant ear corm was probably only planted two to three inches beneath the soil, it can become quite large.
Push down on the handle of your shovel in several spots. This will lift the corm out of the soil. Get all the smaller cormels that are attached to the larger corm. Notice if they separate in the process. If they do, pick them up to dispose of them.
Shake off the excess dirt and throw out the corm and any loose cormels.