Artemisia princeps Seeds | Japanese Mugwort

Japanese Mugwort (Artemisia princeps) with deeply lobed white-felted leaves growing in a dense colony — Japanese Mugwort (*Artemisia princeps*): Asteraceae, the yomogi of Japanese cooking and moxibustion.

LATIN NAME: Artemisia princeps

COMMON NAME: Japanese Mugwort, Yomogi

Plant Profile

Japanese Mugwort is a rhizomatous perennial of the daisy family from Japan, Korea and China, growing sixty to one hundred and twenty centimetres tall with deeply lobed, white-felted leaves and dense autumn panicles of small flower heads. It spreads into colonies by rhizome, colonising road verges, field edges and abandoned ground across its range.

It is the yomogi of the Japanese kitchen: the young spring leaves pounded into mochi and kusa-mochi rice cakes, and the mature leaf dried as a principal source of moxa. The plant is at once a weed of margins and a cultivated tradition, and both descriptions are accurate. The young leaves carry the genus’s aromatic bite, strongest before the stems elongate, and a patch harvested hard in spring regrows through summer for the moxa cut.

Science & Biotechnology

Among East Asian Artemisia species it is one of the most culturally documented, with ethnobotanical studies recording its culinary, medicinal and festival roles, and comparative work has measured the chemistry that distinguishes its leaf from other mugworts.

Its aggressive rhizome spread has drawn ecological study as well, since the species colonises disturbed ground faster than most of its genus, a trait that makes it both a pioneer and a garden problem. Studies of its rhizome growth have quantified the spread rate that makes it both a pioneer on road verges and a management problem in garden soil. Food scientists have examined the young leaf’s nutrient profile, confirming the spring green’s place in the diet beyond tradition alone.

Uses & Benefits

In the kitchen the spring leaf is the point: yomogi mochi, tempura of young leaves, and the bitter-green note that Japanese spring cooking values. The dried leaf feeds the moxa trade alongside its mountain relative.

In the garden give it a contained bed and a spade at the edges; where it is welcome it is generous, and where it is not, it takes over. Street vendors in Japan sell yomogi sweets through spring, and home cooks gather the young leaf from clean margins where the plant is uncontaminated by roadspray.

Growing from Seed

Sow the fine seed on the surface of a moist mix in spring without covering it deeply, and keep it warm and bright; germination is quick and the seedlings vigorous.

Plant out into full sun and ordinary soil a foot apart, and expect the rhizomes to thicken the patch by the second year. Harvest young leaves in spring and cut the stand down twice a season to keep the foliage tender. Give it a bed edged by mowing or a path; the rhizomes respect a cut edge better than any barrier, and the arrangement keeps both sides happy. Water the patch through dry spells if the leaf is being picked; drought-stressed mugwort turns coarse and bitter long before it wilts.

Our Take

The green of spring mochi and the fibre of moxa, spreading at the road edge and the garden bed alike. Contain it, pick it young, and it pays for its keep.

Herb Seeds