Nếu đã lỡ trồng cây và hoa, bạn hãy dùng lưu huỳnh nguyên tố. Đừng làm theo cảm tính mà cho giấm vào đất. Dùng bã hạt bông vải như một loại phân bón giúp tăng độ axit trong thời gian một năm. Kiểm tra độ pH tối thiểu mỗi năm một lần. Tăng độ pH trong đất bằng vôi nếu cần thiết.

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Because it is slow-acting, it's tough to make mistakes at recommended doses. Work it into moist soil as much as possible, without disrupting any root systems. Continue to monitor the pH of the soil as the months pass. Vinegar will lower the pH of the soil immediately, but in this case, it's not a great thing. The change happens too radically, disappears too quickly, and kills off beneficial soil organisms. Stay away from vinegar unless you're okay with the possibility of your plants dying. So you've already treated your soil with iron sulfates, for example, and you've just planted your blueberries. Keep the soil pH low by applying generous amounts of natural acidifying fertilizers such as cottonseed meal. Cottonseed meal, a by-product of cotton manufacturing, is especially great for acid-loving plants like azaleas, camellias, and rhododendrons. Check the pH of your soil near the base of your plants, adding fertilizers such as aluminum sulfate (especially for hydrangeas) without damaging the root system. For the best results, use a commercial pH testing kit or send off a sample of your soil to get professionally tested.  Ornamental plants and vegetables will mostly prefer a slightly acidic environment of between 6.5 and 6.8. Hydrangeas, azaleas, rhododendrons, and blueberries will prefer a more acidic environment — between 5 and 5.5. . In some cases, your efforts to acidify the soil will work too well and you'll be left with soil that is too acidic for your desired plant or vegetable. In these cases, you'll want to alkalize your soil with the addition of lime. Lime comes in three basic varieties — limestone, burned/quicklime, or hydrated lime — and how much to include will depend on the type of soil you have, as well as the variety of lime you choose to use. Inspect the packet for directions or talk to a horticulturist for more information.