"Adding used coffee grounds and diluted brewed coffee to fertilizer can enhance the carbon and nitrogen levels in your soil, giving acid-loving plants a helpful boost."
"The caffeine in brewed coffee or grounds can interfere with the germination process of young plants, inhibiting root growth."
"If you do use coffee to fertilize your garden, it should be used grounds or diluted brewed coffee, and it should be left to decompose for a while before using it in your garden."
Used coffee grounds and diluted brewed coffee can improve soil carbon and nitrogen levels, benefiting acid-loving plants. However, coffee can inhibit germination and root growth in young plants, and excessive acidity can harm alkaline-loving plants. Coffee grounds may also clump, blocking water and air access to roots. For safe use, coffee should be decomposed before application and only used on suitable plants like blueberries, while avoiding it for others that prefer alkaline conditions.
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