How often should I put coffee grounds on roses?
Never leave a layer of grounds on the top of the soil because they can clump and prevent water absorption by the rose roots. Always work the grounds into the soil. Apply coffee grounds as a soil amendment or in compost once in the early spring. Do not apply again during the growing season. Instead of throwing spent coffee grounds in the trash, some homeowners leave piles or lines of coffee grounds around their gardens and homes to keep flies, mosquitoes, and other pests away. coffee grounds are also often used to deter slugs and snails, reduce weeds without chemicals, and even repel neighborhood strays.