Organic McKenzie Rock Flour - Glacial Rock Dust 6lbs

Organic McKenzie Rock Flour is a finely milled glacial rock dust crafted to rejuvenate soil with a diverse array of naturally occurring minerals and trace elements. Harvested from ancient glacial deposits, this rock flour fosters healthier soil structure and robust plant growth while being perfectly suited for organic and sustainable growing methods.

Certified for Organic Agriculture

It is a mined agricultural mineral, in compliance with the California Organic Foods Act of 1990. It is certified for use in organic agriculture, making it an excellent choice for farmers and gardeners committed to environmentally responsible practices.

100% Natural Composition

This product contains only Basalt and Andesite rock flour, derived from natural deposits in the Cascade Mountains of Oregon. It is free of dirt, silts, clays, or other debris—ensuring a clean, high-quality mineral source for your soil.

Guaranteed Analysis

• Calcium (Ca) – 1.00%
• Magnesium (Mg) – 1.00%
• Iron (Fe) – 3.00%

Key Benefits for Gardeners & Farmers

• Rich in essential minerals: Supplies elements like calcium, magnesium, and iron in a slow-release form that nourishes soil and plants over time.
• Improves soil vitality: Enhances soil structure, promotes microbial activity, and supports long-term health of soil ecosystems.
• Boosts plant resilience: Strengthens root systems and improves vigor, helping plants better resist stress from pests, drought, and disease.
• Sustainable and time-tested: Unlike synthetic fertilizers that offer quick fixes, mineral-rich rock dust fosters enduring soil fertility and ecosystem health.
• Organic-friendly: Safe for certified organic production, it works well alongside practices like composting, cover cropping, and natural fertilization.

Practical Uses at Home and on the Farm

• Vegetable beds: Incorporate it into the soil before planting to lay a rich nutrient foundation for vigorous crop growth.
• Fruit trees and perennials: Apply around root zones to support ongoing mineral uptake throughout the season.
• Compost blends: Use rock flour as a compost amendment to feed beneficial microbes and enrich finished compost with trace minerals.
• Lawns and turf: Add a light sprinkling to encourage greener, stronger grass and deeper roots.

Performance, Durability & Eco Compatibility

This glacial rock dust delivers steady mineral release over extended periods, reducing the need for frequent applications. Its enduring nature and natural origins make it both resilient and eco-conscious—perfect for those dedicated to sustainable soil enhancement. Integrating it into your garden or small farm helps build soil health gradually, creating a more balanced growing environment season after season.

To learn more about the benefits and applications of rock dust fertilizers, check out our guide: How to Use Fertilizers: Rock Dust.

Whether you're cultivating a backyard vegetable garden or managing a modest smallholding, glacial rock dust is a practical tool for nurturing soil, strengthening plants, and fostering sustainable productivity.

For additional gardening and fertilizing supplies that support your efforts toward healthy soil and thriving plants, visit our Grow Organic’s Fertilizer & Growing Supplies collection.