Yomogi Mochi: The Mugwort Sweets of Spring

Yomogi mochi blends fragrant young mugwort into soft rice cake, giving Japan a bright green sweet that tastes like spring itself.

Published October 21, 2026 at 11:23 PM JST | By Tokyo Paul

Quick answer: Yomogi mochi, also called kusa mochi, is a Japanese rice cake kneaded with yomogi, or Japanese mugwort, which turns it a deep green with a fresh, herbal aroma. It is usually filled with sweet red bean paste or dusted with roasted soybean flour. It is a spring sweet, linked with the Doll Festival on March 3 and eaten for several centuries.

Walk into a wagashi shop in early spring and a tray of green rounds is easy to spot. Those soft, fragrant sweets are yomogi mochi, and they tell a story about herbs, festivals, and Japanese ideas of fresh beginnings. This guide explains what yomogi is, how the mochi is made, why it is tied to Hinamatsuri, and what to expect when you taste it. It also covers its old history, serving styles, and a few practical notes for travelers and cooks.

What yomogi mochi is

Yomogi mochi is rice cake mixed with chopped or pureed mugwort leaves. In Japanese it goes by several names, including kusa mochi (herb mochi), yomogi dango when shaped as small dumplings, and mochigusa for the plant itself, a name that points to its use in mochi. The mugwort gives the cake its green color, and the more leaf is used, the deeper the green becomes.

The flavor is a pleasant surprise for first-time eaters. The rice itself is soft and mildly sweet, while the leaf adds a clean, slightly bitter, grassy fragrance that cuts through the sweetness of the filling. Many people say it smells like fresh cut grass in the best possible way, and it is a sweet that rewards slow eating with tea.

The plant behind the sweet

Yomogi is Artemisia princeps, a hardy perennial in the daisy family that grows in China, Korea, and Japan. It spreads by underground runners, grows up to about 1.2 meters, and has scalloped leaves with white fuzz on the underside. Young leaves and shoots are picked in spring and eaten as sansai (wild mountain and field vegetables), tempura, and sweets.

Spring timing varies by region and weather, and sources describe the tender picking season anywhere from March into early May. Once the plant flowers later in the year, leaves become tougher and less aromatic. Mugwort is also used in moxibustion, a traditional East Asian practice. Because mugwort belongs to the daisy family, some people are allergic to it, and anyone with pollen or plant allergies should ask before eating.

How yomogi mochi is made

The process takes a few simple steps, and each one is important. Cooks wash the young leaves, boil them briefly, soak them in fresh water, drain or sieve them, and grind them into a smooth green paste.

Separately, rice flour is mixed with sugar and hot water and steamed into soft mochi. Some makers pound glutinous rice instead. The green paste is then kneaded into the hot mochi until the color is even. The dough is divided into pieces and either wrapped around red bean paste or left plain and rolled in kinako, roasted soybean flour. Foraging for wild yomogi near roads is not recommended, since the leaves may carry residue.

A story that begins in the Heian court

Kusa mochi has a long history. A Japanese historical record from the year 850 mentions the custom as part of Heian court life, and Kikkoman's food culture glossary notes that eating mochi with aromatic herbs, believed to ward off evil spirits, arrived in Japan around the 9th century. It is considered one of Japan's oldest sweets.

Interestingly, the first herb was not mugwort. Early versions used hahakogusa, a plant called cottonweed or cudweed in English, and the cake was known as hahako mochi. Over time mugwort took its place. One theory says pounding a plant whose name means mother and child seemed unlucky, though sources note that some areas such as Okayama and Hiroshima still make a cudweed version, so the real reason is unclear.

Hinamatsuri and the green layer

Yomogi mochi is closely tied to Hinamatsuri, the Doll Festival held on March 3. The festival grew from an older seasonal observance and spread among ordinary families in the Edo period as a celebration of girls' healthy growth. Kusa mochi became one of its traditional offerings.

You can also see its color in hishi mochi, the diamond-shaped rice cakes displayed with the hina dolls. They are usually layered in pink, white, and green, and the green layer is traditionally linked to mugwort. The green is often read as the color of new growth and good health. In some homes, yomogi mochi is also linked with Children's Day on May 5, another spring festival.

Fillings and serving styles

The classic filling is anko, sweet red bean paste, which pairs well with the herbal green. Koshian (smooth paste) and tsubuan (chunky paste) are both used, and the choice changes the feel of each bite. Another favorite is kinako, whose nutty taste echoes the leaf.

Yomogi mochi does not have to be eaten fresh. Cooked mochi can be flattened, cut into squares, and grilled until the surface is lightly golden, or added to ozoni soup or zenzai, a sweet red bean soup. Shops often serve it with green tea, such as sencha or the early spring tea called shincha.

Buying and enjoying it

Shops that make it are easy to find. Wagashi stores, department store food halls, and some supermarkets stock yomogi mochi, particularly in the weeks before Hinamatsuri. Freshly made mochi hardens quickly, so it is best eaten soon after buying, and the package will give a date.

Hours and offerings vary, so it is wise to check a shop's website before traveling. Anyone with allergies should check labels, because the sweet can contain soy from kinako, sesame, or other ingredients, and ingredients vary by maker.

Connections to other spring sweets

Yomogi mochi sits within a family of spring wagashi. Sakuramochi, wrapped in a pickled cherry leaf, appears around the same time, and strawberry daifuku and sakura sweets arrive with the first blossoms.

Together they show how Japanese confectionery follows the calendar. A dark green yomogi cake in March or April signals that the season is turning, much like a first plum blossom. Once you know the story of the leaf, every bite carries a little Heian history.

Want to go deeper? Tokyo Paul's book 30 Japanese Wagashi, Seasonal Sweets, and Childhood Classics is available on Amazon.

Frequently Asked Questions

What does yomogi mochi taste like?

Yomogi mochi tastes of soft, mildly sweet rice cake with a fresh, grassy, slightly bitter herb flavor from the mugwort. With red bean paste inside, the sweetness balances the herbal note. With kinako, the taste turns nutty and toasty. Many people enjoy it with green tea.

Is yomogi mochi the same as kusa mochi?

Yes, essentially. Kusa mochi means herb mochi, and yomogi mochi names the herb used. Historically other herbs such as cudweed were used, but mugwort is now the common ingredient. Some shops use the names for slightly different shapes, such as filled cakes or plain dumplings.

When is yomogi mochi eaten in Japan?

It is mainly a spring sweet, especially around Hinamatsuri on March 3, when young mugwort is in season. It can also be found into April and May, and in some homes it is linked with Children's Day on May 5. Availability outside spring depends on the shop.

Further Reading

To explore further, see Kusa mochi (Wikipedia), Kusamochi (Kikkoman food culture glossary) and Hishi mochi (Wikipedia).

Keep Exploring

More guides from Tokyo Paul: Sakura Flavors: Japan's Spring Treats, Dango and Daifuku: Soft Chewy Japanese Sweets Explained and Wagashi Through the Seasons: A Sweets Calendar.