Can I give coffee ground waste to acid-loving plants? I have an espresso machine at home and produce a lot of coffee ground waste every week. I’m thinking re-purpose them. Been told they contain acidity and can be used on plants I have hydrangeas and a few other plants marked as acid-soil loving by planta. Can I scatter dryer up coffee ground waste directly to soil of these plants, or better off just water with coffee ground soaked water? Any advice is highly appreciated. Thanks:)