Be sure to incorporate thoroughly into soil well ahead of planting because of its potentially strong odor. Greensand Mined from an ancient marine deposit in New Jersey, greensand is a long lasting source of potassium. A slow release form of potassium. Most effective when blended into the soil during bed preparation. Recommended for clay soils that compact and do not drain water.
Gypsum loosens the soil allowing penetration of air and water, making the soil friable.
A valuable source of potash. Harvested from cold-water beds off Nova Scotia, kelp meal is recommended as a beneficial supplement to all gardening applications. Use as a fertilizer supplement when preparing the planting area. Use as little as once a year for best results. Rock Phosphate Provides plants with a very long-lasting source of phosphorous.