Using Liquid Coffee
Grind your coffee beans in a coffee grinder until they are a fine grain texture. Brew your coffee as usual.
Combine 3/4 cup of water to 1/4 cup brewed coffee in a separate container, such as a pitcher. This is to dilute the coffee to make it suitable to pour around plants.
Let the coffee mixture cool. It should resemble a weak cup of tea.
Pour the diluted coffee around the base of your house plants, vegetable garden or your potted plants outdoors.
Repeat this procedure once every week to two weeks.
Using Coffee Grounds
Grind your coffee beans in the grinder. Brew your coffee as usual.
Remove the coffee grounds from the coffee filter and spread them out on a clean paper towel to dry.
Sprinkle the grounds around your garden plants, estimating about 1 1/2 cups per square foot of soil. Add the coffee grounds right before watering or before it rains to make the grounds activate as a slow-release nitrogen fertilizer.
Mix coffee grounds directly into the soil around acid loving plants such as tomatoes and those with big flower blooms. This will enhance the vegetable and flower colors.
Repeat this procedure once a month.