Black Swallow Greensand Rock Dust (2kg) is a nutrient-rich, iron/potassium silicate rock dust, also known as glauconite, with over 30 trace minerals that promote plant health and vitality. The dist...
Black Swallow Organic Agricultural Sulfur—90% (1lb) is a highly effective soil amendment designed to lower the pH of alkaline soils, making them more suitable for acid-loving plants. This product h...
