Oyster Shell Flour (50 lb)
Product details
| Management number | 250448371 | Release Date | 2026/09/17 | List Price | US$10.40 | Model Number | 250448371 | ||
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Temporarily unavailable. For poultry use, see Oyster Shell Layer Grade (50 lb bag). It is a coarser layer-grade product, not a direct substitute for finely ground soil-amendment flour. For soil applications, browse calcium fertilizers.
Naturally raise soil pH and boost calcium levels with Pacific Pearl Oyster Shell Flour — a high-quality, organic rock dust fertilizer made from finely ground marine oyster shells. Ideal for gardens, orchards, trees, and compost, this premium soil amendment helps build stronger plants and healthier soil season after season.
Key Benefits
- 96% calcium carbonate for pH adjustment and calcium enrichment
- Improves soil tilth and nutrient uptake
- Strengthens plant cell walls and promotes root growth
- Contains variable particle sizes for both fast and slow nutrient release
- 100% natural and OMRI Listed for certified organic gardening
- Also excellent for bocce ball courts and landscape applications
Application Rates
| Use Case | Amount |
| Flowers & Vegetables | 4–5 lbs per 20 row feet |
| Trees | 1 lb per tree or 1–3 lbs per planting hole |
| General Garden Use | 2–10 lbs per 100 sq ft |
| Agricultural Use | 500–4,000 lbs per acre (based on soil test) |
For best results, apply in early spring or fall and water in thoroughly after application.
Why Choose Our Oyster Shell Flour?
- Made from clean, finely ground oyster shells
- Excellent alternative to lime with longer-lasting results
- Enhances compost quality when blended in
- Improves soil structure in sandy, clay, or compacted soils
- Available in a bulk 50 lb bag, perfect for gardens, orchards, and landscaping projects
How It Works
Oyster shell flour is a natural source of calcium carbonate, a key mineral that raises soil pH in acidic conditions and strengthens plant cell walls. Its slow-release nature, with both coarse and fine particles, ensures nutrients remain available over time. This helps plants absorb fertilizers more efficiently and supports healthier, more resilient root systems.
Great For:
- Organic vegetable gardens
- Fruit trees, berry bushes, and vineyards
- Flower beds and landscaping
- Compost and soil mix improvement
- Bocce ball court base material
Support Sustainable Soil Health
Using natural soil amendments like oyster shell flour reduces dependence on synthetic chemicals, supports beneficial microbial life, and improves long-term soil fertility — making it an essential tool for regenerative and organic growers.
For additional soil improvement options, explore our soil amendments collection.
For fertilizing and plant nutrition, browse our collection of fertilizers.
⚠ Warning: This product or its packaging carries a CA Prop 65 Warning.
California Proposition 65 WARNING: This product can expose you to chemicals known to the State of California to cause cancer, birth defects, or other reproductive harm; for more information, visit www.P65Warnings.ca.gov.
Compare this product with additional nutrient-specific fertilizers selected for garden and farm fertility programs.
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