Organic Sulfur 90% is a concentrated elemental sulfur amendment formulated with bentonite clay for fast, dependable soil pH correction and long-term soil health. Dust-free granules are easy to spread; when they absorb moisture, the bentonite swells and breaks apart, releasing fine sulfur evenly through the soil profile for consistent performance across beds and production fields. Form: Granular elemental sulfur blended with bentonite clay Analysis: 90% S (elemental) Behavior: Moisture-activated; granules swell and disperse for uniform soil coverage Bag Size: 50 lb Primary Use: Lowering soil pH (acidifying) and supplying plant-available sulfur Best For: Alkaline soils; acid-loving crops and ornamentals Application: Broadcast, banded, or incorporated into soil Why Growers Use It Sulfur is more than a soil acidifier—it is an essential plant nutrient involved in protein synthesis and enzyme activation. By lowering pH more quickly than other amendments, this formulation improves availability of phosphorus, iron, and key micronutrients already present in the soil. It also enhances nitrogen efficiency, helping gardeners and farmers get more value from existing fertility programs and supporting vigorous growth, robust root development, and high-quality harvests. Performance & Crop Suitability Fast, reliable pH correction for alkaline soils in gardens and production acreage Even dispersion of fine sulfur after wetting ensures consistent results across beds and rows Ideal for acid-loving crops and ornamentals such as Vaccinium corymbosum (blueberries), Vitis vinifera (grapes), and Rhododendron spp. Supports soil biology and nutrient cycling for long-term soil health and plant care Durable, dust-free granules for easy handling and precise field applications Application Guidelines Always soil test to determine proper rates. Typical rates: 1–5 lb per 100 sq ft (garden beds) or 200–2000 lb per acre (field use), depending on soil pH, texture, and target crop. A little sulfur can stimulate soil micro-life; over-application may be harmful, and some plants are sulfur-sensitive—apply with care. Sustainable Growing This moisture-activated, granular elemental sulfur provides a natural, long-lasting amendment that aligns with organic and sustainable growing practices. Unlike mined sulfur sources, the bentonite-enhanced granule delivers consistent performance and reliable application, helping you balance fertility, manage pH, and improve overall field performance. Learn more about plant nutrition in our article on Macro and Micro Nutrients, or explore complementary Fertilizer & Growing Supplies to support garden and farm productivity.Compare this product with additional nutrient-specific fertilizers selected for garden and farm fertility programs.
