Bổ sung cà phê vào phân trộn. Bổ sung bã cà phê trực tiếp vào đất để tăng độ a-xít. Cân nhắc bổ sung vôi để cân bằng độ pH của bã cà phê. Dùng bã cà phê để bổ sung dinh dưỡng cho đất. Một lựa chọn khác là bạn có thể dùng bã cà phê làm dung dịch phân bón cho cây.

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One of the simplest ways to use leftover grounds is to add them to the rest of your compost. In addition to providing extra organic matter, coffee grounds are able to speed up the decomposing process in compost. Getting this benefit is as easy as pouring the leftover grounds into the compost pile and mixing to incorporate them. There are two main types of composting materials: "green" compost and "brown" compost. Coffee grounds are considered to be "green" compost along with other wet, nutrient rich materials. If you add a lot of coffee grounds to your compost, balance it out by adding some "brown" compost as well — dry, bulky materials like dry leaves, twigs, newspaper, straw, corn husks, sawdust, and so on. On their own, coffee grounds have a pH of about 5.1 — fairly acidic compared to the soil in most gardens. Though this can be too acidic for some plants, it's perfect for some that require extra-high acidity. Just sprinkle a handful of grounds near the roots of the plants at the start of the growing season to get the acidifying effect. Blueberries, cranberries, and citrus fruits like coffee added to their soil. Other coffee-loving plants include camellias, gardenias, rhododendrons, and vireyas. Some flowering plants will give different-colored blooms in acidic soil. For example, the addition of coffee grounds to hydrangeas is good for blue blooms. As noted above, coffee grounds' natural acidity can make them inappropriate for many "average" gardens. To mitigate this, mix a pinch of lime with the grounds. Lime is naturally alkaline (or "basic," the opposite of acidic) and will work against the acidity in the coffee grounds. This lets you add coffee grounds directly to your garden as a mulch or soil conditioner.  Lime (often sold as "garden lime" or "agricultural lime") is a powdery substance that's not related to the green citrus fruit of the same name. You can usually find it at hardware stores or gardening supply stores for fairly cheap. You might add some wood ash rather than lime. Wood ash is...