When sourcing Artemisia Vulgaris, buyers must prioritize purity, volatile oil content, and moisture levels. High-quality mugwort should have a moisture content below 13% to prevent mold during transit. The essential oil content (cineole and thujone) is the primary indicator of potency for medicinal or therapeutic use. Ensure the product is free from heavy metals (Lead, Arsenic, Mercury) and pesticide residues, adhering to Pharmacopoeia standards (e.g., CP, EP, or USP) depending on your target market.