Check the listing for details. Volcanic Rock Dust (Basalt) - soil Amendment (10 lb.). Condition: New. Listed at 34.97 USD. VRD: Volcanic Rock Dust (Basalt) Enhance the soil quality of your flower bed with this sustainable Paramagnetic Rock Dust soil amendment. Made of basalt rock dust, this 5 lb bag is compatible with all purpose plants and is suitable for both indoor and outdoor applications. The powder form of the amendment has a pH value of 7 and is suitable for any type of soil. This soil amendment is designed to improve the nutrient content and structure of your soil, making it more conducive to plant growth. The 1-gallon volume of the bag is perfect for a small flower bed. It is easy to apply and comes in a convenient bag packaging. Get your hands on this high-quality soil amendment and give your plants the perfect soil quality they deserve.Directions for use in the garden and landscape: Up to 25 lbs. per 1000 ft2. Gently dig into soil surface once per month or as desired.Transplanting and premixing soil for potted plants and planter boxes: 1 tbsp. per 1 gal. of soil or growing medium. Gently dig into soil surface once a month or as desired.Top dressing: 1 tbsp. per 1 gal. of soil or growing medium. Gently dig into soil surface once a month or as desired.