Please choose the correct ending to complete the given sentence: Work World: [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.

Ending1: [substeps] 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. Ending2: Use or buy ground coffee grounds since the caffeine in coffee grounds can damage plants' roots. [substeps] Ground coffee grounds are boiled and mixed with water and then added to a fertilizer pile in the garden. Ending3: 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. Ending4: Simply place your coffee grounds in a sack, bag, basket, or other container. [substeps] Many farmers' markets produce organic coffee grounds.

Answer format: ending1/ending2/ending3/ending4