This will acidify the soil for about two years. Lower numbers are acidic, higher numbers are alkaline. Simply add an inch or two of peat to the topsoil in and around plants, or during planting. Before applying any soil amendment, have your soil tested to determine the types and amounts of soil amendments required. Granular sulfur is deemed safe and cost effective for smaller garden areas, with applications of no more than 2 pounds (.9 kg.) As with any amendment, you need to have a soil test conducted in order to determine how much sulfur to apply in order to reach the desired pH. Before you add anything to your soil to make it more acidic, you should make sure the pH is not already at an appropriate level. If you're serious about growing plants or making your soil more acidic for whatever reason, you'll know that professional sampling is more accurate than DIY home tests. For soil to be classified as acidic, its pH has to be below 7. Some crops such as blueberries require acidic soils to grow. When acidic soil is necessary, a soil amendment can be performed to make the soil more acidic. It lasts for years in the soil and does a better job of acidifying than most other amendments. per 100 square feet (9. square meters). Aluminum can be absorbed from drinking water, and excessive use of aluminum sulfate as a soil amendment can contribute to the contamination of groundwater supplies. If you have soil that is not acidic enough for your favorite fruits or flowers, it’s possible to make it more acidic by adding various natural ingredients. Sign up for our newsletter. Vanessa Richins Myers is a seasoned horticulturist, garden writer and educator with 10+ years of experience in the horticulture and gardening space. If it’s high, then lowering it down could make a big difference to how well your berries grow. Lime. It does not work very well to try and dig in sulfur around existing plants. But there are some plants that require a more acidic soil in order to thrive. How to Make Garden Soil More Alkaline. Let’s take a look at how to raise acid level in soil. The ideal soil pH for most landscape plants and turf grasses is around 6.5, which is slightly... Sulfur. Soils vary in their mineral content according to local geology, and these variations affect the relative acidity or alkalinity of the soil—a level that is measured by a pH scale. Get your soil professionally tested for the best, most accurate results. Soil Prep For Blueberry Plant: Lower Soil pH For Blueberries, Fixing A Crepe Myrtle That Is Not Blooming, Crepe Myrtle Trees: Tips For Crepe Myrtle Care, Prickly Kale Leaves – Does Kale Have Thorns, Corn Husk Wreath Ideas: How To Make A Corn Husk Wreath, DIY Air Plant Wreaths: Wreath Making With Air Plants, When To Harvest Rhubarb And How To Harvest Rhubarb, Pruning Rhododendrons – How To Prune Rhododendrons, Thanksgiving Tradition: Turning Homegrown Pumpkins Into Pie, Growing Thanksgiving Dinner – Must Have Turkey Side Dishes, Interesting Uses For Pecans: What To Do With Pecans, The Bountiful Garden: Bringing The Garden To Thanksgiving. It is often used to treat specific symptoms of iron deficiency. One of the easiest ways to make soil more acidic is to add sphagnum peat. It requires some care, however, because it can burn plants by increasing acid levels too quickly. Begin with mild solutions until you understand the impact on your plants. Iron sulfate will provide faster results than sulfur (in three or four weeks) but can damage plants if over-used. Iron sulfate acts more quickly (two to three weeks) but should not be used on a regular basis as heavy metals accumulate in the soil, becoming harmful to the plants. Simply add an inch or two (2.5-5 cm.) Here's how to make your soil more acidic. A variety of soil amendments and fertilizers are available to provide this assistance to acid-loving plants. Both ammonium sulfate and sulfur-coated urea are good choices for making soil acidic, especially with azaleas. Here, the best option is to fertilize with one of the many water-soluble products available, such as Miracid. In many ways, though, it is the best option. Some of the most common and sought-after plants actually prefer acidic soil, even though many of them may be grown in a wide range of growing conditions. Any measurement above 7 is considered alkaline. This is also most often used by large-scale growers rather than the home gardener. However, there are recent concerns about the possible dangers of aluminum toxicity, which can be especially damaging to children.