• Biodynamic Oak Bark Preparation -Quercus alba - (BD 505) Compost Preparation - The Josephine Porter Institute
  • Biodynamic Oak Bark Preparation -Quercus alba - (BD 505) Compost Preparation - The Josephine Porter Institute
  • Biodynamic Oak Bark Preparation -Quercus alba - (BD 505) Compost Preparation - The Josephine Porter Institute
  • Biodynamic BD 505 Oak Bark Preparation package on a clean studio background
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The Josephine Porter Institute

Biodynamic Oak Bark Preparation -Quercus alba - (BD 505) Compost Preparation

Biodynamic Oak Bark Preparation -Quercus alba - (BD 505) Compost Preparation

$6.79 USD
$6.96 USD $6.79 USD
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Description

One unit is 1 heaping teaspoon.

At a Glance:

What it does:
Brings prepared white-oak bark into the BD 502–507 compost set. Biodynamic growers associate BD 505 with calcium processes, compost organization, and plant resilience.

How to use:
Use the finished preparation as part of a complete BD 502–507 set. Make six holes evenly across the compost pile and place this unit into one of the first five holes, about halfway down the pile. Close the hole with old compost or good soil so no air pocket remains. One complete set treats up to 15 tons of compost; use the full set on smaller piles also.

Ingredients:
Oak bark (Quercus alba).

🌳 Learn More about BD505 Oak bark

Product Details:

Measured preparation activity: In a 2026 laboratory study of Italian oak-bark BD 505 made from Quercus robur, it had the highest antioxidant activity among the biodynamic preparations compared in an ABTS assay and stimulated Aeribacillus pallidus culture to about 107 colony-forming units per milliliter. JPI's product uses North American white oak (Quercus alba); follow the current JPI directions to apply the finished preparation with the complete BD 502–507 set.

For complete application directions, visit: BD 502–507 Detailed Usage Instructions

Please note: Quantities over 1 may be bagged together.

Frequently Asked Questions

What is the Biodynamic Oak Bark Preparation used for?

The finished JPI white-oak (Quercus alba) BD 505 is used with the BD 502–507 set in a managed compost pile. Biodynamic growers associate it with calcium balance and plant resilience. A 2026 laboratory study of an Italian, European-oak (Quercus robur) BD 505 measured the highest antioxidant activity among the preparations compared and growth of selected compost-associated bacteria. Apply the purchased preparation directly to compost following the current JPI directions.
How do I use the Biodynamic Oak Bark Preparation?

Use the finished preparation as part of a complete BD 502–507 set. Make six holes evenly across the compost pile and place this unit into one of the first five holes, about halfway down the pile. Close the hole with old compost or good soil so no air pocket remains. One complete set treats up to 15 tons of compost; use the full set on smaller piles also.
What is the main ingredient in the Biodynamic Oak Bark Preparation?

The main ingredient is oak bark, specifically from Quercus alba.
Can I use the Biodynamic Oak Bark Preparation on its own?

The standard JPI compost method uses the finished BD 505 with BD 502, 503, 504, 506, and 507 as a complete set. Place BD 505 in its own hole in the pile; prepare and apply BD 507 separately as directed. Follow the current JPI BD 502–507 compost instructions for the full sequence.