Meet the subject

Bamboo: growth, structure and material uses

竹

Bamboo belongs to the grass family. Bamboos commonly used in Japan include madake, mōsō and hachiku. Their jointed culms arise from underground rhizomes; harvested culms provide tubes, strips and splints for buildings, utensils and weaving.

Shoots arise from buds at underground rhizome nodes; the upright stem is a culm.

A culm reaches height rapidly but does not thicken annually like a tree trunk.

Material age, dimensions and preparation depend on the bamboo and its intended use.

Rhizomes, shoots and culms

The stem above ground and the stem below

The upright bamboo stem is a culm, with nodes, internodes, branches and leaves. Madake and mōsō spread through horizontal underground rhizomes. Buds at rhizome nodes develop into shoots and then new culms, so several stems in a grove can remain connected underground.

Original Japanese label	Part
地下茎	Rhizome connecting shoots and culms
根	Fine roots from the rhizome
筍	Shoot, an early stage of a new culm
稈	Above-ground culm
節	Node
節間	Internode, between two nodes
枝	Branch

Detail of the 2018 bamboo-use guide: culm above ground, horizontal rhizome, fine roots and new shoots.

Rapid height is not material maturity

A shoot can become a tall young culm within months, with growth regions near its nodes extending together. Bamboo lacks the cambium that thickens a tree trunk year after year. Forestry guidance commonly places useful material age at three to five years, depending on species and purpose: reaching full height and maturing as material are different processes.

Take and sasa are not simply tall and short

Japanese usage distinguishes take and sasa partly through the culm sheaths. The agriculture ministry explains that sheaths generally fall away as take grows, while they remain attached on sasa. Height alone does not define the groups; some sasa grow several metres tall.

Usual distinction	Sheath after culm growth
Take	Shed
Sasa	Retained

Medake retains culm sheaths and belongs to the sasa group in this Japanese classification.

Hime-hachiku sheds its culm sheaths and belongs to the take group. It is distinct from the hachiku species discussed below.

Three representative bamboos

Madake has two prominent rings at a node and relatively long internodes, suiting crafts and building uses. Thick-walled mōsō generally has one ring and shorter internodes and is a familiar source of edible shoots. Pale-surfaced hachiku splits finely for tea whisks, lanterns and blinds.

Bamboo	Features and uses
Madake	Two node rings, long internodes
Mōsō	One ring, thick wall; familiar edible shoots
Hachiku	Splits finely; used for tea whisks

Bamboos flower, with different outcomes

Bamboos flower, but the frequency and outcome vary. MAFF’s 2021 account describes mōsō clumps dying down to the rhizomes after flowering, whereas hachiku can retain its rhizomes and produce new shoots after the above-ground culms die.

MōsōFlowering clump can die down to its rhizomes

HachikuRhizomes can survive and send up new shoots

From a culm to useful forms

Lengthwise structure permits splitting

Bamboo’s tissues run mainly along the culm, with denser fibres near the outer surface. It splits readily in that direction while retaining flexibility. A round culm can therefore become strips for weaving, and whole tubes, broad strips and fine splints offer different structural possibilities.

Longitudinally split bamboo strips and splints

Building materials, baskets and utensils

Forestry material lists bamboo in backing for earthen walls and fences, as well as baskets, sieves, tea utensils and musical instruments. Tubular stems and woven strips use different aspects of the same material. Bamboo shoots used as food represent the new-culm stage of the plant.

Long use and changes in bamboo groves

Nara-period objects and drainage material

The Forestry Agency’s 2018 review cites Nara-period bamboo objects preserved at Shōsōin and excavated bamboo thought to have served in drainage. Bamboo supplied objects for daily use as well as hollow material within facilities.

An eighth-century Nara-period cabinet made from bamboo and wood, from the Hōryūji donated treasures. Its bamboo-clad construction offers a surviving example of early bamboo use.

Mōsō has its own introduction history

Mōsō originates in China, but accounts differ about its introduction to Japan. The agriculture ministry presents a 1736 Kagoshima introduction followed by division and distribution, while treating madake and hachiku as longer established. This is a history of a particular bamboo, rather than the beginning of all bamboo in Japan.

Changing demand from the 1960s

The 2018 review discusses mass flowering and death of madake in the 1960s, imported materials and replacement by plastic products among the factors changing production and use. Reduced demand for bamboo household goods also affected the cutting and maintenance of existing groves.

Rhizome expansion continues as use declines

Where use and maintenance decrease, rhizomes may continue spreading beyond a grove. Dense foliage reduces light at ground level and can affect surrounding vegetation. Forestry material therefore considers grove management, cutting and transport alongside product use.

Photo outline or label	Meaning
Light-blue solid line · a	Bamboo extent in 1975
Yellow solid line · b	Expanded bamboo by 2013
Light-green dashed line · c	Mixed bamboo and trees
d 二次林	Surrounding secondary woodland

Detail of the 2013 Ōmihachiman photograph: blue marks the 1975 extent, yellow the expanded area, and pale-green dashes mixed bamboo and trees.

Paper and fuel require production systems

The Forestry Agency’s 2018 account describes bamboo pulp and fuel applications. Harvesting and transport affect costs and supply; fuel use also requires attention to clinker formation and corrosion in combustion equipment.