BD 503: Chamomile – The Plant that Comforts the Compost
What Is BD 503?
Chamomile is a plant known and loved for its calming tea, gentle scent, and white petals. But in biodynamics, it has another purpose: it helps the compost pile stay alive and healthy.
BD 503 begins with German chamomile flowers matured inside a cow's small intestine during winter burial. JPI offers the finished preparation for use as one member of the BD 502–507 compost set; place the finished BD 503 in its own hole in the pile, following current compost directions.
Chamomile has been used as a healing plant since ancient times… The name chamomile comes from the Greek word meaning ‘earth-apple’ and refers to the apple-like fragrance of the plant.
– Abigail Porter with Hugh J. Courtney, Applied Biodynamics, no. 78 (2012): 89.¹
How BD 503 Works
Biodynamic growers use BD 503 in the full compost-preparation set and traditionally associate chamomile with calcium, potassium, nitrogen, and balanced decomposition. In a 2026 in-vitro compost study, mature compost made with the complete BD 502–507 set showed increased growth of selected compost-associated bacteria compared with untreated compost after 120 days, especially in the mixed manure-and-plant compost. This measured result describes the complete set that includes BD 503.
Identifying the correct species is essential to success. Courtney gives a helpful botanical test:
It is important that you have the right variety of chamomile, which is referred to as Chamomilla officinalis, Matricaria chamomilla, Matricaria recutita, or German chamomile… A sure way to tell if you have the right variety is to slice the yellow cone in half vertically. The variety to use will have a hollow center.
– Hugh J. Courtney, Applied Biodynamics, no. 78 (2012): 91.²
JPI supplies finished BD 503 as part of a complete compost set. Place its unit in a separate hole; one complete BD 502–507 set treats up to 15 tons of compost, and JPI also recommends the full set for smaller piles. Good materials, moisture, and aeration help the pile develop alongside the preparations.
The Spiritual Science of Chamomile
In Steiner's spiritual teaching, BD 503 brings order to the changing life of a compost pile. His language of an “astral body” expresses that biodynamic view of how chamomile participates in decomposition and transformation.
Chamomile, however, assimilates calcium in addition (to potash). Therewith, it assimilates what can chiefly help to exclude from the plant those harmful effects of fructification, thus keeping the plant in a healthy condition.
– Rudolf Steiner, quoted in Applied Biodynamics, no. 78 (2012): 105.³
This spiritual picture of digestion and balance guides how biodynamic growers work with BD 503. Alongside that tradition, the compost study above gives a measurable way to discuss the full preparation set's effect on selected bacteria during maturation.
📚 Footnotes
- Abigail Porter with Hugh J. Courtney, “Chamomile: The Healer for People and Plants,” Applied Biodynamics, no. 78 (2012): 89.
- Hugh J. Courtney, “Chamomile: The Healer for People and Plants,” Applied Biodynamics, no. 78 (2012): 91.
- Rudolf Steiner, quoted in Ibid., 105.
Frequently asked questions
BD 503 is the finished biodynamic preparation made with German chamomile flower heads and used as one member of the BD 502–507 compost set. Its careful preparation gives chamomile its preparation-specific role in the pile. See JPI’s compost directions.
BD 503 is the chamomile member of the BD 502–507 compost set. Growers use it for its traditional relationship to nitrogen, calcium, and balanced decomposition. In a 2026 in-vitro study, mature compost treated with the complete set showed greater proliferation of selected compost-associated bacteria after 120 days than untreated compost, with the strongest response in mixed manure-and-plant material. Use finished BD 503 in its own hole and keep the pile moist and well aerated.
Ordinary chamomile plant material can enrich a home compost pile as an organic ingredient. For chamomile’s preparation-specific biodynamic role, use finished BD 503 in its own hole as part of the BD 502–507 set, following JPI’s directions.
JPI offers finished BD 503. For how much to use and where to place it, see the BD 502–507 compost instructions. Choose finished BD 503 for the preparation-specific compost method; raw chamomile flowers remain useful as plant material or for making the preparation.
German chamomile often grows in warm, bright places with open ground, including field margins, gardens, and farm tracks.
At Poraiti Farm in New Zealand, residents used a metal comb to pick chamomile flowers from beds, returning every few days to collect successive blossoms through the season. They stored the dried flowers in paper bags until filling cow intestines for BD 503 in autumn. Read the Agriculture Section case study.
Use this preparation: Shop BD 503 Chamomile · BD 502–507 compost instructions
