Use homemade compost or store-bought compost to add nutrients to your plants.
Used coffee grounds are rich in nitrogen and can be added to the soil or compost bin.
Crushed eggshells are a good source of calcium and can be sprinkled on the soil.
Rich in potassium, banana peels can be chopped up and buried in the soil.
Dissolve Epsom salt in water and use it to water your plants occasionally to provide magnesium.
Use water from your fish tank (without any additives or chemicals) to water your plants for a nutrient boost.
Dilute molasses in water and use it as a soil drench to add nutrients and stimulate microbial activity.
Use brewed, cooled green tea as a liquid fertilizer for your plants.
Rinse off salt and use seaweed as a mulch or compost additive for a nutrient boost.
After boiling vegetables, let the water cool and use it to water your plants for added nutrients.