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Description
Oyster Shell Flour (50 lb)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
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.
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
- Delivery to the USA:
- Standard Shipping : 3-10 business days
- If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
- To process your return/exchange, please contact us at [email protected]
- Please click here for more details>>> Return & Exchange Policy