Genus: Acorus 

Common Names: sweet flag, calamus, chang-pu

There are currently four recognized species (1)  and they are used for various ceremonial, cultural, edible, medicinal, and ornamental purposes - most commonly in Southwest China.

A. calamus  (chang-pu) --  rhizomes used medicinally. Whole plant regarded as sacred and hung in gateways, windows, and doorways to ward away evil spirits. Commonly used as a ceremonial object in festivals and celebrations.  Also cultivated to clean waterways and as an insect repellent. (1)

A. tatarinowii (shi chang-pu) -- rhizomes used medicinally. The most common acorus used in medicine. Cultivated as an ornamental plant in gardens as well as indoors. (1)

A. gramineus (jin qian-pu) -- rhizomes used medicinally. Cultivated as an ornamental and edible plant in gardens and indoors (popular for bonsai). (1)

A. macrospadiceus (shannai) -- a popular spice in Guizhou and Guangxi, most commonly used to flavor meat and fish.  The least commonly used in medicine. (1)

1. Shu, Hang, et al. "Ethnobotany of Acorus in China." Acta Societatis Botanicorum Poloniae 87.2 (2018).

Distribution: North America, North & East Asia, Eurasia

Acorus 'Licorice'

Common name(s): licorice sweet flag

Description: perennial; extremely aromatic grass-like foliage that emits a scent reminiscent of sweet licorice when brushed. 

Height: to 10 in. Spread: to 3 ft.

Position: partial shade and consistently moist soil, or as a houseplant.

Uses: ornamental, bonsai, seasoning, medicine

Winter Hardiness: to 0 F and below