Oyster Shell

Out of stock

For plant health and soil conditioning, we like to add Down To Earth Oyster Shell Flour. The range of particle sizes in this crushed mix ensures rapid and long-term release of calcium which builds stronger plants that can withstand disease and pest assaults. OMRI Listed for use in organic production.

• Excellent source of calcium
• Supports strong root development and uptake of all minerals
• Improves soil texture and aeration
• Raises pH in acidic soils
• OMRI listed

Available in a 6-lb. box


Vegetables/ Flowers: Apply 3-6 lbs per 100 square feet and thoroughly mix into soil. To feed established plants, side dress 2-4 oz, depending on plant size.

Containers: Add 1-2 Tbsp per gallon of soil and mix thoroughly or use 1/2 to 1 lb per cubic yard.

Trees/ Shrubs: Apply 1 lb per 1-inch of trunk diameter, extend outwards from base to the drip line. Mix into soil surface and water well.

Lawns: Broadcast 1/4 to 1/2 cup per 10 square feet depending on soil analysis and water in well.

Grower’s Tip:
Some growers use this to help boost growth of root crops, like beets.