Herbs that Transform Phlegm and Stop Coughing

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What special cooking instruction should be followed when preparing Xuan Fu Hua (inulae flos) as a decoction?

Place in teabag or wrap in guaze
Boil 30-60 minutes longer than the rest of the decoction
Crush before decocting
Add during last five minutes of cooking

Xuan Fu Hua is a flower, and it has little hairs that can irritate the throat or upper digestive tract. It should therefore be placed in a cloth bag or wrapped in gauze or cheesecloth before cooking.

Source: Bensky, D. (2004). Chinese Herbal Medicine: Materia Medica. Seattle, WA: Eastland Press. pp. 434 [Q853]