A member of the Asteraceae family, this large annual herbaceous plant native to Asia has long been used in traditional medicine, particularly to reduce fever. It is also recognized for its antibacterial properties. It gained prominence in 2015 when Chinese researcher Tu Youyou received the Nobel Prize for her work on malaria: she highlighted the effectiveness of an extract from this plant, artemisinin, capable of slowing the progression of the disease or mitigating its effects. Despite these uses, it remains essential to consult a certified naturopath before any medicinal use.

In the garden, its early-season foliage, light as lace, immediately catches the eye. As it matures, it develops into slender branches reminiscent of conifers. It is prized for its size, rapid growth, good drought tolerance, and airy foliage that creates an elegant backdrop. It is also an excellent companion plant thanks to its insect-repellent properties. Its sweet fragrance, reminiscent of bubble gum to some, is released at the slightest touch. It is easily sown directly in the ground and often self-seeds readily.

Finally, as its foliage repels moths, dense wreaths of annual mugwort can be woven to protect clothes, without having to endure the smell of traditional mothballs.