Jonathan Green (11354) Mag-I-Cal Plus Soil Food for Lawns in Acidic Hard Soils MAG-I-CAL PLUS for Lawns in Acidic + Hard Soil is a unique, multi-faceted, soil-enhancing food that rapidly raises soil pH, loosens hard soil, and stimulates soil microbes. MAG-I-CAL PLUS for Lawns in Acidic + Hard Soil contains fast-acting calcium which raises soil pH to enhance nutrient availability from lawn foods and improve cell wall structure. It also fortified with a patented, quick-releasing gypsum to help break up clay and compacted soil for better air, water, and root penetration into the soil. Additionally, MAG-I-CAL PLUS promotes growth by increasing biological activity to aid in the release of trapped nutrients in the soil. Features RAISES SOIL PH - Lawns thrive in soil with pH levels between 6.2 and 7.0. If soil pH is below this range grass becomes light green, weeds persist, and fertilizer nutrients aren't fully absorbed. Mag-I-Cal Plus rapidly and efficiently raises soil pH. LOOSENS HARD SOILS - Mag-I-Cal Plus helps break up clay and compacted soils. This improves root penetration and promotes growth by increasing biological activity and releasing nutrients trapped in the soil. ENCOURAGES NUTRIENT ABSORPTION - Mag-I-Cal Plus increases the ability of your grass to utilize nutrients in the soil. Lawn fertilizer is wasted when soil pH is not balanced. When the soil chemistry is balanced, the nutrients are able to be absorbed. CONTAINS CALCIUM - Calcium is vital to many grass plant functions. It's readily available in Mag-I-Cal Plus for plant uptake or pH adjustment. COMPLETE COVERAGE - This 18 lb bag covers up to 5,000 sq. ft and can be used in spring, summer, or fall. Use the Jonathan Green Pro pH Moisture Soil Tester (11100) or Soil pH Test Kit for Lawns (11595) to measure the soil pH of your yard. USA SHIPPING estimates delivery times and we work to get your item to you as quickly as possible and within those times, but please know it may take slightly longer than the estimate.