L> Compost pH Level, alkaline, Acidic and Neutral levels. By The Gardener"s Network. Even more How to Grow: around Trees Bushes "n Shrubs Plant difficulties Garden Recipes Visit Our other Sites: Garden Hobbies holiday Insights Pumpkin Nook Amazon.com farmers Almanac flowers Bulbs Compost pH level pH is the chemical measure of acidity(sourness) or alkalinity(sweetness). A neutral pH level is 7.0. The pH scale is a range from 0 to 14. 0 is extremely acidic, while 14 is highly alkaline. Garden soil has actually a pH, and varies by form of soil and what is in it. Favor your garden soil, compost has a pH level. This level will also vary, depending on what you put into your composter. Beforehand in the decomposition process, compost often tends to be acidic. The ideal pH for many plants, is in ~ or near the midpoint: 6.5 - 7.0 If compost or soil is as well acidic, or as well alkaline, plants can not grow. A wide variety of materials goes into composters. The components often vary from batch to batch. Many (but no all) plants and also weeds have actually a pH near or slightly below 7. Other compostable items can vary widely. So, it"s essential for you to have some expertise of the pH value of items your ar in your composter, and also ultimately into your garden soil. perform not adjust the compost pH, until it is perfect decomposing. After your compost has decomposed, and also before friend mix that onto her garden, we recommend a fast home soil test for ph levels. See electronic Soil Testers For an ext information, see: floor pH prior to using her fresh compost, you can adjust the pH level. Include a tiny wood ash, or soil limestone to acidic compost. To reduced alkaline levels, you deserve to use sphagnum peat, element sulfur, aluminum sulfate, or stole sulfate.