[header] How to fertilize a garden cheaply [title] Use coffee grounds as fertilizer. [step] 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. 
Use your own coffee grounds or ask coffee shops for their used grounds. [substeps] Let the used coffee grounds dry and then scatter them like mulch over your plants.