Mash a fresh and ripe banana and apply it evenly on the cracked heels. This should be left for the next 10-15 minutes and then washed off. Following this remedy each day will start giving visible results in 1-2 weeks.
Lemon is known to have acidic properties that in turn help to remove roughness of the skin which is a major cause for cracked heels. Lemon juice can be applied directly on the cracks or else you can soak the feel in a tub of warm water with lemon juice in it and then remove the rough skin with pumice stone and then pat dry the feet followed by application of a moisturizing lotion.