These plants grow slowly, but they prefer to be root-bound, so you only need to move to the next size up when repotting your corn plant. You’ll want to repot your corn plant once its roots fill the container — this will happen every two or three years. To repot a corn plant, lift the plant from its current container and gently remove the surrounding soil, without disturbing the roots. Fill the new pot with soil, being careful not to pack the new soil too tight.