Japanese Kadsura

In late autumn a ball of scarlet fruit dangles on a thin stalk under glossy evergreen leaves, as if someone had pressed a handful of red beads into a sphere and hung it in the woods. Follow the stalk back and the stem keeps going, wound around a branch or a fence wire. This plant climbs by turning.

That stem carries the vine’s best-known story. In Japan, Kadsura japonica has an old nickname, binan-kazura, the handsome man vine. Japanese botanical guides explain why: when the bark of the stems was peeled and the pieces left in water, they gave off a thick, slippery liquid, and men once used it to dress and style their hair. People once soaked this vine’s stems in water and used the slippery liquid to style their hair. Its everyday Japanese name, sanekazura, points to the other thing people notice, a vine whose fruit stands out.

Japanese kadsura is an evergreen woody vine. The leaves are smooth, dark green and shiny, usually oval with a pointed tip, and their edges can be nearly smooth or finely toothed. In summer, small cup-shaped flowers hang from the leaf joints on slender stalks. Their creamy to pale yellow tepals, the word botanists use when petals and sepals look alike, cup a round center. In a male flower that center is a tight red knob of stamens, the pollen-making parts. In a female flower it is a globe of many tiny carpels, the parts that become fruit. Each carpel later swells into a small red to purple segment, and together they make the autumn ball.

Male and female flowers usually grow on separate plants, so a lone vine in a garden may flower without ever making fruit. That habit is shared by Japanese skimmia, which can fool a quick glance in winter with its glossy leaves and red fruit. Skimmia is an upright shrub, though, and its berries sit in loose clusters rather than one packed ball.

The vine is native to the warm forests of southern Japan, the Ryukyu Islands, southern Korea and Taiwan. Flora of China describes it in forests, often near rivers, from close to sea level up to about 2,000 meters. In Japan it is a common climber of low mountains and is often planted along hedges. Carl Linnaeus first named it in 1753, and gardeners far from East Asia now grow it for its leaves and fruit. The first community record here came from Lower Silesian Voivodeship, Poland, a long way from any wild population, which fits a plant that travels mostly as a garden vine.

Its flowers keep unusual company. Researchers watching several related Kadsura species in China found that tiny night-flying resin midges pollinate them. The midges walk over the center of the flower to lay eggs, moving pollen as they go, and their larvae grow inside resin-filled chambers in the flower. Those studies did not include Japanese kadsura, so for this species it is a strong family clue rather than a settled fact. The jade vine is another woody climber whose flowers depend on visitors that arrive after dark, though its partners are far larger. On the leaves, the caterpillars of a small moth, Caloptilia kadsurae, feed on this plant.

Below the vine the story is quieter. Growing guides describe moist, well-drained soil that is neutral to acidic, and a plant that puts up with sand, clay and poor ground. The sources do not show it building soil or changing the leaf litter in any special way. Picture a forest rooter that sends most of its effort upward, into stems that wind toward the light.

If you find one this autumn, look closely at the fruit ball first. Count the small segments packed together, and notice how long the stalk has grown since flowering. Then follow the stem back and check which way it twines around its support. In summer, compare several flowers on the same plant: a red knob means a male flower, while a many-parted globe could someday become the scarlet ball. A vine that once helped people fix their hair is still doing a climber’s patient work, turning, reaching, and in a good year hanging out a handful of red.