This study investigated the effect on the artemisinin content of various techniques usually used in Madagascar (as well as some others) for drying Artemisia. The conclusions were that: long drying durations (up to 3 weeks) did not cause damage, and if well managed could increase artemisinin content; covering plants at night or in case of rain had no effect; and the colour of leaves is not a criterion for quality.
Presentation from Artemisinin Conference 2010, Antananarivo, Madagascar, 12-14 October 2010. 14 pp.
Comparison of different drying techniques in Madagascar