Plants and Flowers in Tokyo & Japanese Culture by Kei Narujima　東京の草花＆つぶやき

Green Stink Bug (Glaucias Subpunctatus)　アオツヤカメムシ

英語の後に日本語が続きます。

I found a green stink bug (Glaucias subpunctatus) on the stamens of a pink edged white sasanqua flower. It's autumn, so naturally many fallen leaves are on flowers and this green bug looked like a leaf at first. Most stink bugs die in winter but this type overwinters in their adult form in Japan.

Stink bugs are increasing in Japan due to warmer winters and increasing food resources (e.g., cedar and cypress cones) in urban areas, resulting in widespread damage to rice, other crops, and other plants across Japan.

2025/11/19

Two Quinces　木瓜と花梨

英語の後に日本語が続きます。

These are all Chinese quinces. The green ones are fruits of Chaenomeles speciosa and the yellow ones are Pseudocydonia sinensis. Both are in the Rosaceae family but they're different plants and so is the hardness of their peel. The yellow one's peel (Pseudocydonia sinensis) is harder than the green one's (Chaenomeles speciosa) although jam made from Pseudocydonia sinensis and Chaenomeles speciosa is both "sour" sweet that some find it not sweet enough and a little astringent.

2025/11/17

Autumn Leaves　紅葉

英語の後に日本語が続きます。

The best season for autumn leaves in Tokyo is from late November to early December and leaves on some trees have started to change color. Many go to famous (and sometimes distant and busy) places to see fall leaves but you can enjoy autumn foliage here and there in Central Tokyo without being disturbed by crowds.

2025/11/14

2025/11/17

2023/11/24

Princess Flowers (Pleroma Urvilleanum)　シコンノボタン（紫紺野牡丹）

英語の後に日本語が続きます。

Princess flowers (Pleroma urvilleanum) are native to Latin America and produces beautiful purple flowers in autumn in Japan. Its Japanese name is "shikon nobotan," which translates into "navy purple Malabar melastome" after its color. As the name suggests, not only its petals but also the short and long stamens are all purple.

2025/11/16

Purple Woodsorrel (Oxalis Purpurea)　フヨウカタバミ（芙蓉酢漿草）

英語の後に日本語が続きます。

Purple woodsorrel (Oxalis purpurea) is native to South Africa. The plant came to Japan in the late 18th century and now can be found across Japan. Purple woodsorrel produces pink and white flowers from April to July in general but when warm from November to March, too. Its Japanese name is "fuyou katabami," which translates into "rose marrow woodsorrel" because of its resemblance to rose marrow.

2025/11/16

Wax-Leaf Privet (Ligustrum Japonicum)　ネズミモチ（鼠糯）

英語の後に日本語が続きます。

Wax-leaf privet (Ligustrum japonicum) trees can be found across Japan. They produce flowers from May to June (which I've never seen) and fruits from October to December, which are green at first and turn purplish black. The former half of the tree's Japanese name "nezumi mochi" comes from the fruits. The name translates to "mouse mochi" because the fruits look like mouse droppings and the leaves resemble those of the mochi tree or the elegance female holly (Ilex integra). The fruits of wax-leaf privet (despite them looking like mouse droppings) are used in herbal medicine.

2024/12/29

2025/11/13

Japanese Laurel (Aucuba Japonica)　青木（アオキ）

英語の後に日本語が続きます。

Japanese laurel (Aucuba japonica) is native to, and can be found across, Japan. The plant produces small purplish brown flowers from March to May and oval fruits in autumn, which are green at first and then turn bright red beautifully in mid-December. Most of the leaves are deep green while some are variegated.

The name "Aucuba" is derived from one of its Japanese names "aokiba," meaning "blue leaf" because the leaves and stems are "blue" throughout the year. Blue? You think I mistook "green" for "blue"?

I didn't! In Japan, people use "blue" for "green." For example, they say "blue" traffic lights and "blue" apples, instead of "green" lights and "green" apples. This is because Japan used to have only four colors, white, black, red, and blue, and the then "blue" included green. In "The Man'yoshu," the oldest existing collection of waka or Japanese poetry, compiled sometime after AD 759 during the Nara period (710-784), green leaves were described as "blue" leaves. The color green was differentiated from blue in the 10th century.

2024/2/5

2023/12/29

2025/11/10

Henbit Deadnettle (Lamium Amplexicaule)　ホトケノザ（仏の座）

英語の後に日本語が続きます。

Henbit deadnettle (Lamium amplexicaule) can be found across Japan. The plant is supposed to produce flowers from March to June but as you can see in these photos, it has flowers throughout the year but summer. The flowers have a unique shape with spots, which plays an important role to attract pollinators, like bees. Its Japanese name means "lotus seat for Buddha." How lovely would it be to sit on it!😊

2025/1/30

2022/11/7

Ginkgo (Ginkgo Biloba)　イチョウ（銀杏）

英語の後に日本語が続きます。

The ginkgo (Ginkgo biloba), a gymnosperm plant, has male and female trees. The male does not produce flowers but pollen while the female produces fruits from September to November. In Central Tokyo, you can see many ginkgo trees but most of them in the office district are male to prevent people from stepping on the fruits. Ginkgo fruits are so stinky, smelling like something rotten, when raw that nobody wouldn't want to step on them but they're considered one of the autumn delicacies in Japan.

Its leaves turn bright yellow (or golden!) beautifully. According to "The Process of Leaf Color Change," in autumn triggered by shorter days and lower temperatures the leaves stop their food making process. The chlorophyll breaks down, the green colour disappears and the yellow and orange colours become visible. At the same time other chemical changes may occur which form additional colours through the development of red pigments. Some mixtures give rise to reddish and purplish autumn colours such as dogwoods and sumachs, while others give maple its brilliant orange. The autumn foliage of some trees show only yellow colours, whilst others like oaks show only brown. All these colours are the varying amounts of the chlorophyll residue and other pigments in the leaf.

The next question is how? Does the color change happen in all parts of the leaves at the same time or from one part to another? You can see the answer in the last two photos of ginkgo leaves changing yellow from the edge to the middle😊!

2024/11/30

2025/11/1

2025/11/10

Dawn Redwood (Metasequoia Glyptostroboides)　メタセコイア

英語の後に日本語が続きます。

Some plants are aesthetically pleasing throughout the year and dawn redwood trees (Metasequoia glyptostroboides) are one of them. Last autumn, their leaves created a gorgeous view (scroll down). In spring, their small cones made me chuckle and the leaves created a magnificent, fresh green view. And yesterday, I found a tree with fruits, which look like matcha chocolates.

The dawn redwood is a living fossil species. They're tall and their leaves look like fern leaves, which explains to me why I feel like I were in the dinosaur era under the trees.

2025/6/6

Ring-Cupped Oak (Quercus Glauca)　アラカシ（粗樫）

英語の後に日本語が続きます。

Ring-cupped oak or Japanese blue oak trees (Quercus glauca) can be found almost across Japan. They produce acorns from October to November and the acorns are not only fed on by insects and birds but were eaten by people as a famine food in Japan. Oak trees are usually known for the acorns but ring-cupped oak trees produce beautiful cylindrical flowers (6th and 7th photos) and red shoots (5th photo), which look like the heads of Pteranodon (to me), from April to May.

2025/11/8

Chinese Quince (Pseudocydonia Sinensis)　カリン（花梨）

英語の後に日本語が続きます。

The Chinese quince (Pseudocydonia sinensis) is native to China but now can be found across Japan. The plant is known for the fruits but enjoyable throughout the year. Its pink flowers are pretty, jam made from the fruits is yummy, and the autumn leaves are so colorfully beautiful.

2025/4/9

Single-Flowered White Sasanqua Camellia　一重の白い山茶花

英語の後に日本語が続きます。

Single flowered camellia sasanquas are less gorgeous than but as beautiful as double flowered ones and are easier to access for insects.

2025/11/8

Hydrangea Turning Red in Autumn　秋色紫陽花

英語の後に日本語が続きます。

The hydrangea was pale pink, blue, and green in early summer. So, its color change to red toward autumn surprises me (3rd photo). Such a color change occurs because of increasing anthocyanin due to a change in the temperature and/or the amount of ultraviolet radiation. For whatever the reason, it's just amazing.

2025/6/8

2025/5/29

2025/11/1

Sacred Bamboo (Nandina Domestica)　ナンテン（南天）

英語の後に日本語が続きます。

The sacred bamboo (Nandina domestica) is native to China and came to Japan before the 16th century and now found across Japan. The plant is called "南天 (nanten)" in Japanese, which translates to South India, because it was believed to have come from there. The term "nanten," however, can also be written as "難転," which translates into "a blessing in disguise" and therefore the sacred bamboo is used for Japanese New Year decorations.

The sacred bamboo is known for its beautiful red berries but its leaves also turn red gorgeously from late autumn to winter.

2025/11/3

2021/11/14

Pale Grass Blue (Pseudozizeeria Maha)　大和小灰蝶（ヤマトシジミ）

英語の後に日本語が続きます。

A pale grass blue butterfly (Pseudozizeeria maha) is plain at a glance (3rd photo) but you would be surprised when seeing the upper side of a male one, which is beautiful pale blue as its name suggests. Butterflies are known to open their wings to bask in the sun to warm their bodies, so you're more likely to see the beautiful blue in autumn than summer.

The pale grass blue resembles the plains cupid (Luthrodes pandava) very much except for the latter having orange spots on the wings. I once mistook a plains cupid for a pale grass blue.

2025/11/2

2024/11/5

2022/11/9

Common Straight Swift (Parnara guttata)　イチモンジセセリ（一文字挵）

英語の後に日本語が続きます。

Butterflies usually fold wings when resting while moths with open wings. The common straight swift (Parnara guttata) is a butterfly but sometimes rests with open wings to absorb the warmth of the sun, thanks to which I've learned that their back is green (in the 1st and 2nd photos). The 3rd photo is of an ant carrying a dead common straight swift.

The common straight swift is called "ichimonji seseri" in Japanese, meaning "straight line skipper" after its white spots in a straight line while small branded swift (Pelopidas mathias), which has white spots in a circle, is called "chabane seseri," meaning "brown wing skipper."

2025/11/2

2025/10/13

Pink and White Marbled Sasanqua Camellia　源平咲きの山茶花

英語の後に日本語が続きます。

Sasanqua camellias (Camellia sasanqua) are native to Japan and can be found across Japan. The plant produces white, pink, and red flowers from October to December, earlier than Japanese camellia (Camellia japonica), which is one of the differences between the two camellias.

These two camellias resemble each other and experts provide several ways to distinguish them. One is the size of trees and another the timing of flowering, but the most interesting difference is how they fall or die. Sasanqua flowers die with petals falling off one by one while when Japanese camellia flowers die, the flower heads fall off in their entirety and this way of dying was associated with beheaded human heads in the Edo (samurai) period. Naturally, despite its beauty, the Japanese camellia was unpopular among samurai. If you're interested in such "beheaded" camellias, read this post!

If you're interested in other marble colored flowers, read the following posts!

2025/11/1

2023/12/25