Eggshells are owerhouses of calcium and other mineals. It can used to enrich soils for healthy crop. Good rich soil means everything for a gardener looking to raise healthy plants as there are so many chemicals and expensive solutions to achieve this which is not natural, however, there are simple remedies to boost crops and ensure organically healthy crops. Eggshells have nitrogen, calcium, and phosphoric acid which make them an ideal   choice for garden use.