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The Josephine Porter Institute

Biodynamic Horn Manure Preparation (BD #500) BD Spray Preparation

Biodynamic Horn Manure Preparation (BD #500) BD Spray Preparation

Regular price $10.90 USD
Regular price Sale price $10.90 USD
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BD #500 stimulates seed germination, root growth, and humus formation. Use when planting, transplanting or turning in cover crops.

How to use BD #500

Stir for one hour in 3 to 5 gallons of water. BD #500 should be applied in the afternoon. Spray immediately after stirring. One unit per acre is the established minimum for noticeable results.

But Rudolf Steiner's original indications recommended much more per acre:

"As regards quantities and dilution, I have ascertained by repeated observation that an area of about 1500 square yards (near one-third of an acre) can be served with the contents of such a cow horn, diluted in about half a bucket full of water." Rudolf Steiner, Agriculture Course, Lecture IV

For those who wish to follow Steiner's original indications, one horn's worth is generally 3 units. If we were using Steiner's initial indications, it would be 9 units of 500 per acre (though he does suggest that less would be needed per acre as the size of the treated land increased). We recommend at least 3 units of 500 per acre for a stronger effect and we also recommend considering Steiner's additional indications:

"Before you make use of the manure thus prepared, press out the flowers of Valerian. Dilute the extract very highly. (You can do it at any time and keep it, especially if you use warm water in dilution). Add this diluted juice of the Valerian flower to the manure in very fine proportions. There you will stimulate it to behave in the right way in relation to what we call the 'phosphoric' substance." Rudolf Steiner, Agriculture Course, Lecture V

For best results, 500 should be combined with 507. One unit of 507 (~20 drops, 1ml) per acre is a minimum, though if you wish to see more dramatic regenerative effects, more is suggested. 

"To build a nourishing blaze, we need to use good kindling, but if we really want to “fire up” the release of ethericity, we must accelerate the decomposition of what is stored in the soil. To do so, we must look for the biodynamic analog for lighter fluid–we introduce something volatile, easily combustible, and rich with etheric life potential–the special juice of pressed flowers of Valerian (Valeriana officinalis), which is especially rich in essential oil." Fanning the Flame of Life with Biodynamics by Stewart Lundy

For best results, use 3 units of 500 plus 1 unit of 507 per acre. Begin the one-hour stirring 500 as usual. After 40 minutes, add the appropriate amount of Valerian for the final 20 minutes

For additional information, visit: JPI Preparation Articles ; Instruction Handouts

Additional Article: BD #500: Reflections on Making BD #500


How to use


Our current shipping policy is as follows: all orders will be shipped via USPS within two business days after payment is received, unless different shipping instructions are received at the time the order is placed.

Final shipping cost depends on the amounts ordered, proper shipping container size, as well as destination shipped to. If your order is returned due to an incorrect shipping address you will be responsible for the postage to reship the package. 


If you have any questions or concerns please email us at contact our office at (540) 745-7030. Thank you for your ongoing support.

Return policy

We offer a Full Money Back Guarantee on all our preparation products when returned within 30 days. However, we must advise that all publication (books, DVDs, etc.) sales are final. All refunds will be provided as a credit to the credit card used at the time of purchase within five (5) business days upon receipt of the returned merchandise. Return shipping costs are your responsibility. If 30 days have gone by since your purchase, unfortunately we can’t offer you a refund or exchange.


To be eligible for a return, your item must be unused and in the same condition that you received it. It must also be in the original packaging.

Several types of goods are exempt from being returned. Perishable goods such as food, flowers, newspapers or magazines cannot be returned. We also do not accept products that are intimate or sanitary goods, hazardous materials, or flammable liquids or gases.

Additional non-returnable items:

  • Gift cards
  • Downloadable software products
  • Some health and personal care items

To complete your return, we require a receipt or proof of purchase.

Please do not send your purchase back to the manufacturer. There are certain situations where only partial refunds are granted: (if applicable)

  • Book with obvious signs of use
  • CD, DVD, VHS tape, software, video game, cassette tape, or vinyl record that has been opened.
  • Any item not in its original condition, is damaged or missing parts for reasons not due to our error.
  • Any item that is returned more than 30 days after delivery

Refunds (if applicable)

Once your return is received and inspected, we will send you an email to notify you that we have received your returned item. We will also notify you of the approval or rejection of your refund.

If you are approved, then your refund will be processed, and a credit will automatically be applied to your credit card or original method of payment, within a certain amount of days.

Late or Missing Refunds (if applicable)

If you haven’t received a refund yet, first check your bank account again.
Then contact your credit card company, it may take some time before your refund is officially posted.

Next contact your bank. There is often some processing time before a refund is posted.

If you’ve done all of this and you still have not received your refund yet, please contact us at

Sale items (if applicable)

Only regular priced items may be refunded, unfortunately sale items cannot be refunded.

Exchanges (if applicable)

We only replace items if they are defective or damaged. If you need to exchange it for the same item, send us an email at and send your item to: 652 Thompson Rd, Floyd, VA, 24091, United States.


If the item was marked as a gift when purchased and shipped directly to you, you’ll receive a gift credit for the value of your return. Once the returned item is received, a gift certificate will be mailed to you.

If the item wasn’t marked as a gift when purchased, or the gift giver had the order shipped to themselves to give to you later, we will send a refund to the gift giver and he will find out about your return.


To return your product, you should mail your product to: 652 Thompson Rd, Floyd, VA, 24091, United States.

You will be responsible for paying for your own shipping costs for returning your item. Shipping costs are non-refundable. If you receive a refund, the cost of return shipping will be deducted from your refund.

Depending on where you live, the time it may take for your exchanged product to reach you, may vary.

If you are shipping an item over $75, you should consider using a trackable shipping service or purchasing shipping insurance. We don’t guarantee that we will receive your returned item.

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Customer Reviews

Based on 5 reviews
Paul Kennedy
Amazing Preparation

The BD #500 supplied by The Josephine Potter Institute works perfectly and has an extraordinary immediate impact on the energetic field of our garden and yard - quite remarkable!

Konstantina C
Amazing results

I ve been using the BD some years . Fast delivery. In an excellent condition. The BD 500 helped the balance in my garden. I have some veggies and hundreds of pollinators flowers. I really never had an issue with overpopulation of harmful bags since I started the biodynamic way of taking care my garden. I use the BD 500 but I use also the collection of BD for the compost I make. I have amazing results. My friends tell me that they feel that my plants are healthy strong and full of energy and I really feel the same. The soil smell so nice. Im truly looking forward to another beautiful season- zone 6b


Love them, I but every year

Judith P
Nature loves you back

Stirring my prep I had my phone timer set and also chose to play some spa type music for both myself and nature. While I stirred I deeply connected with the Nature Spirits of the garden, the soil and the potential of what was possible for the coming season. Engaging in some chanting, prayer and toning brought us all together as ONE. An awe filled experience. I KNOW the deep heart centered connection was all brought together with the help of the prep and the sacred space I created during the process. Namaste


Praise be to All Divinity in every form. Thank you so much for honoring our sacred home planet.