The purple bamboo’s culm is a deep, somber purple-black: purple from the shoot stage, deeper still when mature, with a pale ring at each node—exactly like an old brush on a scholar’s desk.

A Coat of Purple-Black

The purple bamboo’s culm is a deep purple-black—purple from the shoot stage, deepening as it matures, with a pale ring at each node, like the sheen worn onto an old brush handle.

Most bamboo is green; only this one gleams black. A clump standing at the wall corner is worth a long look even without flowers.

— Botany Notes, self-inscription —

A body of purple that no one admires—

still, read it as an old brush before the courtyard.

Fine Material for Flutes

Purple bamboo has been premium material for xiao and di flutes since ancient times: culms fine and even, walls thick and solid, and the finished flute’s tone clear and pure, low without being muffled—a distinct voice in many melodies.

A stalk of purple bamboo growing before the courtyard keeps company with people as a piece of music. Cut down, holed, made into an instrument, it then speaks for people—the closest relationship the Chinese have ever had with bamboo.

Beside Temples and Studies

For its deep, refined color, purple bamboo has long been planted outside temples and studies: a clump leaning against a whitewashed wall suits that quiet air better than any lively blaze of red flowers.

Its shoots are edible, and the timber also goes into brush handles, fan ribs, and walking sticks. The finer the use, the more handwork it demands—and the more it matches the impression it leaves: quiet, meticulous, easy on the eye.

• How to know it: Running bamboo; culms purple-black, up to six meters tall, with longitudinal grooves between nodes; shoots in spring, sheaths purple-brown.
• Season: Shoots in spring; culm color deepest in summer and autumn; on winter days, purple culms with a few lingering leaves show its quietest face.
• Caution: Culm color depends strongly on light; for a deeper shade, plant in a well-lit spot.

Why It Is Purple

The culm color comes from pigment accumulating in the surface: young culms emerge purplish-red, and as the wood lignifies the color deepens toward black, with plants in full sun the most intense.

So within one clump, the sunlit side is blacker and the shaded side browner. It was not born so dark—it was sunned into it, day by day, like the patina of an old wooden thing.

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Keywords: purple bamboo · xiao and di flutes · courtyard · bamboo timber