5-Pound Oyster Shell, For Use In Organic Gardening

Down To Earth®’s Oyster Shell is an all-natural and high-quality source of the essential plant nutrient calcium. Ancient oyster shells are carefully harvested and then ground into small, medium and coarse particles. These irregular shapes provide a sustained release of this valuable nutrient. DTE® Oyster Shell also aids in improving structure of soils and building optimum tilth.

Application Rates

2 cups ≈ 1 lb; 1/2 cup ≈ 4 oz; 1 tbsp ≈ 0.5 oz

• Vegetable Gardens & Flower Beds:
  • To prepare new gardens, apply 2.5-5 lbs per 100 square feet and thoroughly mix into the top 3″ of garden soil in spring or fall. For new transplants, add 1-2 tsp per hole, mix into soil and water in well.
• Outdoor Containers:
  • For new plantings, add 1-2 tbsp per gallon of soil and mix thoroughly OR add 0.5-1 lb per cubic yard. For established plants, lightly mix 1-2 tbsp per gallon into the soil surface every other month during the growing season.
• Lawns:
  • In spring and fall, apply 2.5-5 lbs per 100 square feet and water in well. Results may be enhanced if applied following aeration.
• Trees & Shrubs:
  • Spread 1 lb per 1″ of trunk diameter around the base outwards to the drip line, mix into soil surface and water in well. For new trees, prepare transplant hole and mix 1-2 cups with the backfill soil. Use the amended soil to fill in around the new tree; water in well.
• Row Crops/Acreage:
  • Apply 500-2,000 lbs per acre initially followed by annual maintenance applications depending on soil analysis and crop requirements.