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Overview
Arundo donax L. — commonly called giant cane or giant reed — is a tall perennial grass of the family Poaceae. For reed makers only the woody, hollow stem matters: when split, gouged and scraped, its outer wall becomes the vibrating blade of a double reed. The same species supplies cane for the single reeds of clarinet and saxophone, but oboe work draws on a narrower, denser grade of stem.
A finished reed is a small machine. The cane must flex tens of thousands of times an hour without fatiguing, hold a knife-thin edge at the tip, and return to rest precisely. Almost everything a player feels — resistance, response, the stability of pitch — begins with the quality of the cane and how it was cured and seasoned before a knife ever touched it.
The plant
Giant cane grows in jointed stems called culms, divided by solid nodes roughly every 15–30 cm. Only the straight, even sections between nodes — the internodes — are usable, because a node interrupts the long fibres the reed depends on. The wall thickness, curvature and the density of the vascular bundles running lengthwise through that wall are what makers grade for.
Stems reach three to six metres in a single season, but maturity matters more than height: cane is cut from stems that have stood for one to two years, when the wall has lignified and the colour has begun to turn from green toward straw. Younger cane is soft and watery; over-mature cane turns brittle and grey.
Arundo donax is almost always propagated from rhizome cuttings, not seed — most stands are effectively clones. This is part of why a single grower's cane can be remarkably consistent year to year, and why switching suppliers can feel like switching instruments.
Where good cane grows
The grass will grow almost anywhere warm and damp, but cane prized for oboe reeds comes from a narrow band of Mediterranean climate — long dry summers, mild winters, and soil that drains hard. The historic centre is the Var region of southern France, around Cogolin and Fréjus, with significant production in Spain, Italy, Argentina and parts of California. Growers and makers argue endlessly about terroir; what is not in dispute is that climate and curing shape cane far more than latitude alone.
From field to gouged cane
Between the standing grass and a folded blank lie months of patient, low-tech work. Rushing any stage of it shows up later as warping, splitting, or a reed that simply will not settle.
Harvest & curing
Cane is cut in winter, when sap is lowest, then stripped of leaves and stood in the open to sun-cure. Over several weeks the green chlorophyll breaks down and the stems take on the familiar golden colour. Curing in the sun rather than a kiln lets the wall dry slowly and evenly — the difference between cane that stays flat and cane that twists on the gouger.
Seasoning
After curing, the stems are bundled and seasoned — aged in a dry, ventilated store for two to three years. Seasoning lets internal moisture equalise and the fibres relax, so the cane is dimensionally stable by the time it is split, pre-gouged and gouged to its final wall thickness. Makers who season their own cane often speak of it the way winemakers speak of a vintage.
"I stayed with cane I had seasoned myself. It taught me to read the stem before I read the reed — and it cut my waste in half."Natalia Mielnik · oboi.st
Diameter & tube selection
Tube cane is sorted by outside diameter, because diameter sets how much the gouged piece will curve when folded — and that curvature has to match the staple it will be tied onto. Pick cane a half-millimetre too wide and the blades sit open and leaky; too narrow and the reed closes up and chokes. The ranges below are typical starting points, not rules.
Table 1 — Typical tube-cane diameter by instrument
| Instrument | Diameter | Common staple |
|---|---|---|
| Oboe | 10.0–10.5 mm | 46–47 mm |
| Oboe d'amore | 10.5–11.0 mm | 50–51 mm |
| English horn | 10.5–11.0 mm | 26–27 mm (cor) |
| Bassoon | 24–26 mm | — |
Within a diameter class, makers grade further by wall thickness and by how straight the grain runs. A piece whose vascular bundles run parallel and tight to the surface will hold a cleaner scraped tip than one with bundles that wander.
Density & hardness
Density is the maker's best single predictor of how a piece will play. Denser cane is generally more durable and projects more, but resists the air and needs more scraping; lighter cane responds easily but tires and goes soft. Many makers float-test or weigh gouged pieces and group them, so that a batch of blanks behaves consistently under the knife.
Hardness is checked with a dial hardness tester that presses a fixed point into the gouged surface; readings let you sort cane into soft / medium / hard before investing scraping time. There is no universal scale — what matters is grouping like with like within your own gear.
Store seasoned cane and gouged blanks at a stable 40–55% relative humidity. Sudden swings are what crack tube cane and warp gouged pieces — far more than the absolute level. A simple sealed box with a humidity buffer outperforms an expensive cabinet that is opened ten times a day.
Working dimensions
Once cane is selected it is gouged to a measured wall, then folded over a shaper tip that sets the outline of the blade. Tip width changes the whole character of the reed: wider shapes give a darker, more flexible reed; narrower shapes give stability and edge. The figures below are common oboe starting points.
Table 2 — Common oboe gouge & shape figures
| Measurement | Typical range | Effect of more |
|---|---|---|
| Gouge, centre | 0.58–0.62 mm | Darker, more resistant |
| Gouge, sides | 0.42–0.48 mm | Freer, less stable |
| Shaper tip width | 6.9–7.4 mm | Darker, more flexible |
| Tie length | 72–74 mm | Lower, more open |
None of these numbers act alone. A wide shape on thin-gouged, light cane is a different instrument from the same shape on dense cane — which is exactly why makers keep a written log of cane, gouge, shape and result, and change one variable at a time.
Sustainability
Because Arundo donax is fast-growing and clonal, the plant itself is in no danger — in much of the world it is classed as invasive. The real pressures are agricultural: traditional Var growers are few and ageing, climate is shifting the dry-summer band that good cane needs, and demand for hand-made reeds keeps rising. Buying graded cane from named growers, and wasting less of every piece through careful selection, is the most direct thing a maker can do.
Continue reading
From here, follow the cane into the workshop: Gouging sets the wall, Shaping sets the outline, and Scraping turns a blank into a playing reed. For the tool that does most of that work, see The reed knife.