Just like you may need that cup of coffee to energize your day, our plants need the nitrogen and minerals found in used coffee grounds to boost their life. Other natural elements that sustain plant growth such as calcium, copper and potassium are also found in our caffeine byproduct. Some experts suggest using the grounds only on acid loving plants or on alkaline soil, Start slowly by mixing modest amounts in to your potted plants or garden-try 1 tablespoon for pots and one cup for gardens. I also suggest drying the grounds before using them so there is no concern over mold growth.
Sustainable Enterprises suggests sprinkling used grounds around plants before watering for a slow-release nitrogen, or dilute with water for a gentle, fast-acting liquid fertilizer.
Those plants really are apart of the family—you can feed your household scrambled eggs, then feed your plants with the leftover eggshells. The soil around potted plants, your vegetable garden and outdoor trees will get an incredible boost from the shells calcium composition, which is almost 98 percent of the shell.
First wash and dry out the eggshells. Then, place them in a bag or blender and crush them in to a powder-like consistency. Simply sprinkle the eggshell powder around your trees and plants.