Valerian flowers (Valeriana officinalis) 
Valerian flowers (Valeriana officinalis), a perennial plant with white or pinkish flowers.
Characteristics
- It flowers in early summer, in damp places and at woodland edges.
- Its flowers have a strong scent; the root has a very distinctive smell.
- In biodynamics it is the basis of preparation 507, a fermented flower juice.
Role in the preparation: The flowers are pressed into a juice that is left to ferment, then stirred into water before use on the compost.
Caution: Keep the juice in a bottle with a cap that lets gas escape, somewhere cool and dark; do not consume.
Sources: Valerian (herb) - Wikipedia · Biodynamic agriculture - Wikipedia
Documentary information: this is neither a recommendation for use nor a plant-protection or veterinary claim. Check your country's regulations before any use.