3. Egg shells
If you are experiencing a blossom end rot problem in your garden, you can easily treat and control this by just using egg shells. From the 4 eggs that you used in making your deer repellent, take the shells and crush them, then mix the crushed egg shells into the soil around your crops. As the egg shells dissolves and decomposes, the calcium that is released from the dissolving egg shells will be absorbed by the roots of the plants and in turn will control the blossom end rot problem in your garden.