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How to fertilize a garden cheaply
Use coffee grounds as fertilizer.
Used coffee grounds contain good nutrients for plants like nitrogen, phosphoric acid, and potash. They are particularly good for blueberries, evergreens, azaleas, roses, and fruit trees.

Pick your answer from:
--Write down how many grounds you use using standard household grounds. Use about 60 to 90 pounds (172 to 126 grams) of ground coffee grounds per 50 square feet..
--Use or buy ground coffee grounds since the caffeine in coffee grounds can damage plants' roots. Ground coffee grounds are boiled and mixed with water and then added to a fertilizer pile in the garden..
--Use your own coffee grounds or ask coffee shops for their used grounds. Let the used coffee grounds dry and then scatter them like mulch over your plants..
--Simply place your coffee grounds in a sack, bag, basket, or other container. Many farmers' markets produce organic coffee grounds..
Answer:
Use your own coffee grounds or ask coffee shops for their used grounds. Let the used coffee grounds dry and then scatter them like mulch over your plants.