Gardeners looking to enhance their hydrangea and rose blooms this summer may find a simple solution in their kitchen. According to experts at Bloom and Song, used coffee grounds can serve as a natural fertiliser, providing essential nutrients and deterring pests like slugs.
Coffee grounds are slightly acidic, which benefits acid-loving plants such as hydrangeas and roses. They improve soil structure, enhance drainage, and add organic matter. The caffeine in coffee grounds also dehydrates slugs, making them an effective natural deterrent.
To use, apply a thin layer of coffee grounds around the base of the plants, ideally mixed with compost or other kitchen scraps like banana peels or eggshells. Feed approximately 100g per plant once a month during the active growing season, from mid-spring to early summer, and water afterwards to help nutrients seep into the soil.
The nitrogen, phosphorus, and potassium in coffee grounds promote lush foliage and healthy blooms. For hydrangeas, the acidity can influence flower colour, turning them blue in acidic soil. However, experts caution against overuse, as too much can burn plant roots.
With careful application, coffee grounds can lead to more vivid and abundant flowers this summer, making them a valuable addition to any gardener's routine.
