(Image credit: Shutterstock) If you love coffee and hydrangeas, I’ve got the perfect hack for you. Instead of throwing out your coffee grounds after enjoying a fresh brew, save them to add to your soil. It may seem like magic, but the coffee grounds intensify the blue color in hydrangeas, resulting in bold blue blooms. Article continues below Coffee ground magic (Image credit: Shutterstock) Coffee grounds are a great organic kitchen waste product to recycle in the garden to benefit your plants and soil, and apart from boosting the health of hydrangeas, they can also change the color of the blooms . But be warned, fresh grounds are too acidic and may damage the plant. It’s all to do with the soil's pH level (Image credit: Shutterstock) Since coffee grounds are acidic, they gradually lower soil pH, enhancing blue hydrangea blooms. In fact, the coffee grounds help hydrangeas absorb aluminum in the soil, which is responsible for the color change.…