Artemisia princeps aka Japanese Mugwort
Taxonomy ID: 21266
Artemisia princeps belongs to Asteraceae, the daisy family. It is a herbaceous perennial: a soft-stemmed plant that lives for years. People call it Japanese mugwort or yomogi. It comes from temperate eastern Asia, from China through Korea to Japan. In Japan, its range includes Honshu, Kyushu and Shikoku. It is not native to Britain or Ireland. In Japan, it grows on waste ground and among thickets. These sites lie in lowlands and at low heights.
Plants grow fast and reach about 4 feet [1.2 metres]. The wider reported height range is 2–5 feet [0.6–1.5 metres]. Stolons, or stems below ground, let it spread fast. They carry growth beyond the spot where it first grew. This can make it invasive in a garden bed. Choose its site with care because of this spread. It blooms from July through November. Each flower has both male and female organs. Wind carries the pollen. Seeds ripen from August through November.
The plant grows in sand or loam that drains well. It suits soil that is neutral to mildly alkaline. It grows in full sun or light shade. Soil may be dry or moist, and plants withstand drought. PFAF lists this species for USDA zones 4–9. But its growing notes raise doubts about hardiness in Britain. They suggest it may grow outdoors across much of Britain. Read the zone range with those doubts in mind.
People eat the leaves and young seedlings raw or cooked. They use them in salads and soups after removing the bitter taste. Young leaves give rice dumplings called mochi their flavour and colour. Cooks boil the leaves for a short time for this use. Then they pound them into the rice. People also pick wild plants to add flavour to food. PFAF notes use as medicine but gives few details. It reports no known toxicity. This does not prove that the plant is safe for pets.
Grow plants from seed, division or basal cuttings, taken at the base. Sow seed on the surface from late winter to early summer. Keep the seed compost moist in a greenhouse. Keep seedlings under cover through their first winter. Plant them outside in late spring or early summer. Divide plants in spring or autumn. Take basal cuttings in late spring. Plant them once they have roots.
Common names
Japanese Mugwort, Korean Mugwort, Yomogi, Korean WormwoodMore information about Japanese Mugwort
How difficult is Japanese Mugwort to care for?
Artemisia princeps is an easy-to-grow, low-maintenance perennial. It is vigorous and adaptable, tolerating a range of soil types and moisture conditions, and is drought-tolerant once established. Gardeners should be aware that it spreads aggressively via underground stolons and may require containment to prevent it from becoming invasive in the garden.
How big does Japanese Mugwort grow?
Artemisia princeps grows to approximately 1.2 metres (4 feet) tall. It has a moderate growth rate and spreads laterally through underground stolons, which can result in wide colonies over time. Spread is not fixed — containment methods are recommended for cultivated settings.
How often should Japanese Mugwort be watered?
Artemisia princeps is drought-tolerant once established and performs well in both dry and moderately moist conditions. It does not require frequent watering and prefers well-drained soil; waterlogged conditions are not suitable. PFAF notes that plants of related species are longer lived and more aromatic when grown in lean, dry conditions.
What kind of soil does Japanese Mugwort need?
Artemisia princeps prefers light (sandy) to medium (loamy), well-drained soils with a neutral to mildly alkaline pH. It does not require rich or heavily amended soil — a poor, dry substrate tends to produce more aromatic, long-lived plants. Related species in the genus tolerate a pH range from about 4.8 to 8.2.
What temperature does Japanese Mugwort prefer?
Artemisia princeps is a cold-hardy perennial native to temperate East Asia. The closely related Artemisia vulgaris (common mugwort) is rated hardy to USDA zones 3–9 and UK hardiness zone 3, suggesting a similarly wide cold tolerance for A. princeps. It thrives in temperate climates and does not require winter protection in most cool-temperate regions.
What humidity does Japanese Mugwort prefer?
No specific humidity requirements have been documented in available sources for Artemisia princeps. As a field and roadside plant across temperate East Asia, it is adapted to typical ambient outdoor humidity and is not sensitive to low humidity conditions.
How should Japanese Mugwort be fertilized?
No fertilizer-specific guidance is documented for Artemisia princeps in the available sources. Related Artemisia species are noted to be longer lived and more aromatic in poor, dry soils, suggesting this species does not require or benefit from heavy fertilization.
How do I care for Japanese Mugwort throughout the seasons?
Artemisia princeps blooms from July through November. As a perennial, it dies back in winter and regrows from its rootstock and stolons in spring. Stolon spread should be managed seasonally to prevent the plant from overtaking adjacent areas. Young leaves are best harvested in spring and early summer before flowering for culinary use.
Is Japanese Mugwort fragrant?
Artemisia princeps has characteristically aromatic foliage, typical of the Artemisia genus. The leaves carry a herbal, slightly bitter scent and are valued as a flavoring and coloring agent in East Asian cuisine. Related species are noted to be more aromatic when grown in dry, poor soil.
When does Japanese Mugwort flower?
Artemisia princeps produces small, buff-colored flowers from July through November. The flowers are hermaphroditic and wind-pollinated. Seeds mature from August through November. The flowers are not ornamentally significant and are primarily involved in wind-mediated reproduction.
What varieties of Japanese Mugwort exist?
GBIF records recognize several infraspecific forms and varieties within Artemisia princeps, including f. dentata Pamp. and var. candicans Pamp. A number of former variety-level names from related species (e.g., Artemisia vulgaris subsp. nipponica, A. indica var. maximowiczii) are now treated as synonyms of A. princeps Pamp. under current taxonomy.
Can Japanese Mugwort be grown outdoors?
Artemisia princeps is best suited as an outdoor plant. It grows naturally in roadsides, slopes, valleys, and riverbanks across China, Japan, and Korea, and has naturalized in parts of Europe. It performs best in full sun to semi-shade in well-drained soil. Its vigorous stolon-spreading habit makes it unsuitable for small contained beds without barrier management. It is not typically grown as a houseplant.
How should Japanese Mugwort be pruned?
No specific pruning guidance is documented in available sources for Artemisia princeps. As with other Artemisia species, cutting back the plant after flowering may help prevent excessive self-seeding and encourage fresh, aromatic growth the following season. Stolon control by division or root barrier is recommended to limit spread.
When should Japanese Mugwort be repotted?
Artemisia princeps is not typically grown as a container or houseplant; repotting guidance is not documented in available sources. In container culture, dividing and repotting every few years would be appropriate to manage vigorous stolon growth.
How do I clean Japanese Mugwort?
No specific cleaning or leaf maintenance guidance is documented for Artemisia princeps in available sources. As an outdoor herbaceous perennial, spent stems can be cut back seasonally.
How do I propagate Japanese Mugwort?
Artemisia princeps propagates naturally and vigorously via underground stolons. It can also be propagated by division of established clumps. Seed propagation is possible given that seeds mature from August through November following wind pollination.
Why are my Japanese Mugwort leaves turning yellow?
No specific guidance on yellowing leaves is documented for Artemisia princeps in available sources. Yellowing may indicate waterlogged or overly nutrient-rich soil, as related Artemisia species prefer poor, dry conditions and are stressed by excess moisture.
Why are my Japanese Mugwort leaves turning brown?
No specific guidance on browning leaves is documented for Artemisia princeps in available sources. As a deciduous perennial, foliage naturally dies back in autumn and winter. Brown tips in the growing season may indicate drought stress beyond the plant's tolerance, though it is generally drought-tolerant once established.
Why is my Japanese Mugwort drooping?
No specific guidance on drooping is documented for Artemisia princeps in available sources. Drooping stems may occur after heavy rain or in very fertile, moist soils that promote lush, floppy growth. Staking is not normally required for outdoor plants in suitable conditions.
Why is my Japanese Mugwort dropping leaves?
Artemisia princeps is a perennial herb that dies back naturally to the ground in winter. Leaf drop in the growing season is not typical and may indicate root disturbance, waterlogging, or pest damage.
Why is my Japanese Mugwort growing slowly?
Artemisia princeps has a moderate growth rate and is generally vigorous. Slow growth may be caused by shaded conditions, cold temperatures, or compacted, waterlogged soil. The species is not considered a slow grower and spreads readily under favorable conditions.
What pests and diseases affect Japanese Mugwort?
No specific pest or disease issues are documented for Artemisia princeps in available sources. Skin contact with the foliage of some Artemisia species can cause dermatitis or allergic reactions in susceptible individuals. The species is generally robust and resilient.
How is Japanese Mugwort pollinated?
Artemisia princeps is wind-pollinated. The flowers are hermaphroditic (containing both male and female reproductive structures) and bloom from July through November. Seeds mature from August through November.
Is Japanese Mugwort edible?
Artemisia princeps is edible, with a PFAF edibility rating of 2 out of 5. The leaves are the primary edible part and are used both raw and cooked. In Japan, young leaves are pounded into glutinous-rice dumplings (kusa mochi, yomogi mochi) and rice-flour dumplings (kusa dango), and used in soups and rice dishes. In Korea, the plant (ssuk) appears in jeon (savory pancakes), ssuk kimchi, ssukguk (soup), tteok (rice cakes), and ssukcha (mugwort tea). Bitterness is typically removed by boiling before use in salads and soups.
What are the medicinal uses of Japanese Mugwort?
Artemisia princeps has a long history of use in traditional East Asian medicine, particularly in moxibustion — the practice of burning dried plant material — used across China, Korea, Mongolia, Tibet, Nepal, and Vietnam. As a bitter herb, it has traditionally been used to stimulate appetite and digestion. Peer-reviewed research (141+ studies) documents anti-inflammatory, antioxidant, antimicrobial (MRSA, Streptococcus mutans), antithrombotic, and anti-cancer (sesquiterpenoid dimers artemiprinolides A-M) activities. However, the NCCIH and Kew MPNS note that clinical evidence in humans remains insufficient to recommend the plant for any specific health condition. It should be avoided during pregnancy.
What are the other uses of Japanese Mugwort?
No significant non-food, non-medicinal uses are documented for Artemisia princeps; PFAF assigns an other-uses rating of 0 out of 5. Essential oil volatile compounds from the plant have been studied for species identification and quality assessment purposes. The plant holds deep cultural and mythological significance in Korea, featuring in the Tan'gun founding legend.
What is the region of origin of Japanese Mugwort
What is the sunlight requirement for Japanese Mugwort
Is Japanese Mugwort toxic to humans/pets?
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