Pro-Pell-It! Cottonseed Meal 5-2-1 is a great all-purpose fertilizer. Due to its slightly acidic nature, Cottonseed Meal is ideal for plants that thrive in acidic soil such as blueberries, strawberries, azaleas, and rhododendrons. Historically this product was registered organic with WSDA. However, due to new regulations regarding the use of GMO products this product is no longer organically certified despite being packaged under the Pro-Pell-It! name.