Using Coffee Grounds For Houseplants. To use coffee grounds as fertilizer simply sprinkle them onto the soil surrounding your plants. Coffee grounds work wonder if mixed with egg shells especially on vegetables like tomatoes but also on plants like roses or hydrangeas.
Theyll be able to take advantage of the leftover nitrogen in the coffee grounds. Many people recommend using coffee grounds on the soil to help bring down the pH of alkaline soil to a more neutral because coffee is acidic. Coffee grounds work wonder if mixed with egg shells especially on vegetables like tomatoes but also on plants like roses or hydrangeas.
The lower the pH the more acid.
Coffee grounds are a good source of nitrogen encourage the growth of the beneficial microorganisms in the soil and help plants that prefer acidic growing medium. Ideally you can add a spoonful of coffee grounds to your plants every 4 to 6 weeks. To use coffee grounds as fertilizer simply sprinkle them onto the soil surrounding your plants. It can lead to unnecessary moisture retention impair growth of the plants and even fungal overgrowth.