An Introduction to the Effects, Actions and Key Cultivation Techniques of Anemarrhena and Phellodendron

Anemarrhena and Phellodendron is a commonly seen paired combination of herbs in traditional Chinese medicine, referring to the paired use of the two medicinal materials Anemarrhena (Zhimu) and Phellodendron (Huangbai). Anemarrhena comes from the dried rhizome of the perennial herbaceous plant Anemarrhena asphodeloides, mainly produced in North China and other areas; Phellodendron is the dried bark of the rutaceous tree Phellodendron chinense or Phellodendron amurense, the former commonly known as Chuan Huangbai (Sichuan Phellodendron) and the latter as Guan Huangbai (Northeast Phellodendron). Both drugs are cold in nature and bitter in taste, and both belong to the commonly used heat-clearing class of Chinese medicinal materials.

In terms of effects, Anemarrhena excels at clearing heat and draining fire, and at nourishing yin and moistening dryness, and is mostly used for such conditions as cough due to lung heat, steaming bone tidal fever, and thirst with restlessness; Phellodendron is distinguished by clearing heat and drying dampness, and by draining fire and eliminating steaming, and is often used for damp-heat diarrhea and dysentery, jaundice, and sores and swellings. When the two drugs are used in mutual reinforcement, their action of nourishing yin and lowering fire becomes more prominent; the classic Chinese patent medicine Zhibai Dihuang Wan is made by adding these two drugs to Liuwei Dihuang Wan, and is mostly used for patterns of yin deficiency with hyperactive fire.

In terms of cultivation, Anemarrhena is cold-tolerant and drought-tolerant, and prefers sunny, well-drained sandy soil; it can be propagated by seed or by division of roots, and during the growing period attention should be paid to intertillage and weeding, with timely drainage during the rainy season. Phellodendron prefers a cool and humid climate, and plots with deep, fertile, loose soil should be chosen; generally seedlings are raised first and then transplanted, and after planting, water and fertilizer management should be strengthened, along with good prevention and control of common diseases and insect pests; when stripping the bark, the method must be appropriate so as to benefit the tree's recovery and continued use.

It should be noted that although Phellodendron, Coptis chinensis and Scutellaria baicalensis all belong to the heat-clearing and dampness-drying drugs, their applications differ in emphasis; it is generally held that Scutellaria baicalensis tends to clear the fire of the upper jiao, Coptis chinensis tends to clear damp-heat of the middle jiao, and Phellodendron tends to clear damp-heat of the lower jiao. Anemarrhena and Phellodendron are bitter and cold in medicinal nature, and those with spleen-stomach deficiency cold should use them with caution; before daily use it is best to consult a professional physician or pharmacist, as only treatment based on pattern differentiation and appropriate combination can achieve the desired effect.