Mugwort can be used as medicine and also for moxibustion.
Tips
culture
Hung above doorways during 端午节 (Dragon Boat Festival, 5th day of 5th lunar month) along with 菖蒲 (calamus) — believed to repel insects, illness, and evil spirits during the disease-prone summer.
memory
艾 = mugwort, 草 = grass/herb. The compound just adds a generic 'herb' suffix to make the plant name unambiguous.