From the Manufacturer:
We prepare our Chickweed extract from the flowering aerial parts of Stellaria media plants which are Custom Wildcrafted™ in their natural wild habitat or Certified Organicallly Grown.
To assure optimal extraction of Chickweed's bioactive compounds, the herb is hand-harvested while in flower, is carefully shade-dried to retain its full color & aroma, and is then thoroughly extracted.
Our Chickweed is never fumigated or irradiated.