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Oyster Shell


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SKU: R21939

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Oyster Shell flour is an all-natural source of high quality Calcium that is ground into varying sizes to ensure an immediate and sustained release of this valuable nutrient. Calcium promotes strong root development, improves nutrient uptake and boosts plant immunity. Oyster shell builds optimum tilth by improving texture, aeration and water penetration of soils.

Application Rates:

Vegetable Gardens & Flower Beds: Apply 2-6 lbs per 100 square feet and thoroughly mix into soil.

Lawns: In fall or spring, apply up to 100 lbs per 1,000 square feet and water in well. Repeat annually, gradually reducing the application as soil pH increases to ideal level.

Trees & Shrubs: Spread 1lb per 1" of trunk diameter around the base and outwards to the drip line and water in well. Repeat annually, gradually reducing the application rate as plant vigor and soil pH increase to ideal levels.

Guaranteed Analysis:

Calcium (Ca) 36%

What is "N-P or K"?

Nitrogen (N) - Nitrogen is necessary for lush, green, leafy growth. An excess, however, will promote vegetative growth at the expense of the fruit or flowers. Nitrogen is generally applied at higher concentrations in early growth stages.

Phosphorus (P) - Phosphorus will promote big, bright bloom and enhanced fruit production. Phosphorus is essential for fruiting, flowering, strong root growth and quality seed development.

Potassium (K) - Potassium, or potash, helps produce strong sturdy plants and quality fruit. Potassium naturally increases a plants resistance to all types of stress and is vital for cell growth and carbohydrate metabolism.

Down To Earth has been supplying premium quality natural and organic fertilizers and soil amendments to gardeners, farmers and manufactures for over 30 years. Down To Earth offers a complete selection of all natural products for your home and garden. Packaging printed on 100% recycled (85% post-consumer) box board with vegetable-based inks.

Listed by the Organic Materials Review Institute (OMRI) for use in organic crop production.

This product is shipped from one of our warehouses in Northern California. Orders placed after 12 p.m. will typically ship the following business day. To see an estimate of our delivery times, click here.

Returns & Replacements
Products can be returned for a refund within 30 days of receipt if unused and in original packaging. Returns are paid for by customer unless product is defective or damaged, in which case Real Goods assumes responsibility. Please use Fedex, UPS, or USPS with tracking, for returns.

Returns of solar panels, inverters or other large ticket items will incur a re-stocking fee of up to 20%. Freight shipping is non-refundable.

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