nitrates

Many anecdotical or scientific results indicate that leaves and stems of Artemisia annua have different therapeutical properties, often higher for leaves, sometimes lower.
Our efforts so far to elucidate key factors explaining these differences have failed. Artemisinin, polyphenols, essential oils are higher in leaves, scopoletin sometimes lower. If the therapeutical properties against malaria, bacteria or nematodes, really are proportional to the concentration of these organic key constituants, the healing power of stems and twigs should be close to zero.