Among clarinetists and saxophonists, the practice of breaking in new reeds has become ritual. Players rotate them, moisture cycle them, and let them mature with the belief that careful handling improves performance. A closer look at wood science, acoustics, and microbiology tells a different story. Reeds do not mature. They degrade. Understanding why changes how you care for them.
Breaking In or Breaking Down? The Reed Myth Examined
Reed degradation is not a quirk of cane. It is a fundamental property of lignocellulosic materials. Reeds are cut from Arundo donax, a lignocellulosic grass composed of cellulose, lignin, and waxes. This structure makes reeds both strong and fragile. They must be capable of vibrating thousands of times per second yet are highly sensitive to moisture and mechanical stress. Each playing session subjects them to three compounding processes.
Moisture cycling causes cane to expand and contract with humidity swings, stressing the cellular structure with every session. Leaching draws water and solvents through the cane, removing sugars and waxes that contribute to stiffness and resilience. Cell collapse follows from repeated wet and dry cycles combined with vibration, producing microcracks and parenchyma wall failure that cannot be reversed.
The result is a steep loss of stiffness, not growth toward maturity.
What Research Shows
Scientific studies have repeatedly confirmed a pattern of degradation rather than maturation.
Akahoshi and Obataya (2015) found that cane specimens lost 10 to 20 percent of stiffness after only 3 to 5 wet and dry cycles, and over 30 percent by 20 to 30 cycles. Damping rose correspondingly, reducing liveliness. The sharp initial drop explains the break in illusion. Degradation slows after the early cycles, which creates the appearance of stabilization.
Kemp (2019), in a doctoral study at McGill University, tracked real clarinet reeds over 2.5 months of active playing. Reeds lost 30 to 60 percent of tip stiffness and 5 to 25 percent at the heart. Micro CT scans confirmed cell collapse and thinning throughout the cane structure. Vibration and microbial activity accelerated decline beyond what moisture alone produced.
These findings are consistent. Reeds do not improve. They degrade from the first session forward.
Why They Sound Better
Many players perceive broken in reeds as warmer and less harsh. This is a real perception arising from a real physical change. Loss of stiffness shifts vibrational modes and alters harmonic content, producing a darker, softer sound. What feels like improvement is degradation reshaping tone. A reed is less like a fine wine improving with age and more like a piece of bread, fresh at first and already beginning to stale.
The Psychology of Break In
Three factors reinforce the break in myth. Perceptual adaptation leads players to unconsciously adjust embouchure and air support, making reeds feel more consistent over time regardless of their physical state. Apparent stabilization follows because the steep initial decline slows after the first several sessions, creating the illusion of settling into a stable condition. Confidence rituals provide psychological assurance through handling routines that can enhance performance independent of any physical change to the reed.
None of these factors constitute maturation. They are adaptations to decline.
The Hidden Ecosystem: A Public Health Issue
Reeds are porous, organic, and continually bathed in saliva. This makes them reservoirs for microorganisms, and the research on what lives in used reeds is relevant to anyone who plays a cane instrument regularly.
Glass et al. (2011) cultured bacteria, yeasts, and molds directly from used woodwind and brass instruments, including Staphylococcus and Candida species, and concluded that reeds represent a significant contamination risk.
Marshall and Levy (2011) conducted prospective studies applying potentially pathogenic bacteria, including Staphylococcus, Streptococcus, Moraxella, Escherichia coli, and an attenuated strain of Mycobacterium tuberculosis, to reeds and simulating clarinet play. Most bacteria survived for 24 to 48 hours. The attenuated Mycobacterium strain persisted for up to 13 days. Reed instruments consistently carried higher microbial loads than flutes or brass mouthpieces.
Mobley and Bridges (2015, 2016) identified diverse microorganisms in condensate from both brass and woodwind instruments and concluded that instrument hygiene represents an overlooked public health concern in ensemble settings.
Beyond health risks, microbial colonization further weakens the reed. Bacteria multiply rapidly at moisture levels at or above 90 percent relative humidity, while xerophilic fungi can grow at relative humidity levels as low as 60 percent. Both thrive in the conditions that reeds experience during and after play.
Evidence Based Reed Care
The research points toward a small set of practices that genuinely extend reed life and reduce health risk.
Rotate reeds daily across a set of four to six. This spreads the steep early degradation across multiple reeds rather than concentrating it on one, extending the useful life of each.
Control humidity in storage. The target range is 58 to 64 percent relative humidity, high enough to prevent the brittleness that comes from drying out, and low enough to suppress both bacterial and fungal growth. A dedicated reed case with humidity regulation, such as the Brad Behn Reed Case reviewed here, is the most reliable way to maintain this range consistently.
Keep reeds flat. A reed with a flat back seals reliably against the mouthpiece table. Before each session, confirm the seal with the pop test. A failed pop test on an otherwise good reed is a reliable signal that the back needs attention.
Clean the mouthpiece, not the reed. Mouthpieces are nonporous and can be sanitized effectively with soap and water or appropriate disinfectants. Reeds cannot be adequately sanitized without accelerating their degradation.
Avoid alcohol soaking. Ethanol and isopropanol strip lignin and waxes from the cane structure, accelerating the very degradation you are trying to slow. Safer alternatives for surface disinfection include UV-C exposure or dilute hydrogen peroxide applied briefly and rinsed.
Conclusion
Reeds do not break in. They break down. Moisture, vibration, and microbial activity drive rapid early decline followed by slower ongoing failure. What players perceive as improvement is a combination of perceptual adaptation, apparent stabilization, and the confidence that comes from consistent handling routines.
Break in rituals are not harmful if they provide reassurance, but the benefits are psychological rather than physical. Real gains come from evidence based care: rotation, controlled humidity, mouthpiece hygiene, and realistic expectations about reed longevity. Reeds are perishable materials. The best we can do is manage them wisely.
Further Reading
For related reading on reed storage, instrument hygiene, and the acoustic role of the reed in the playing system:
For a detailed review of humidity controlled reed storage, read: Brad Behn Reed Case Review: A Technical Assessment of Humidity Control for Cane Reeds.
For the pop test as a diagnostic tool for reed sealing, read: The Pop Test Is Not Optional.
For the broader acoustic context in which the reed operates, read: The Hidden Architecture of Saxophone Sound.
A complete list of all Jazzocrat essays can be found here.
Bibliography
Akahoshi, Takashi, and Eiichi Obataya. 2015. “Effects of Repeated Moisture Sorption on the Dynamic Young’s Modulus and Loss Tangent of Reed Cane (Arundo donax L.).” Wood Science and Technology 49: 865–878. https://doi.org/10.1007/s00226-015-0720-y.
Glass, R. Thomas, Robert S. Conrad, Gerwald A. Kohler, and James W. Bullard. 2011. “Evaluation of the Microbial Flora Found in Woodwind and Brass Instruments and Their Potential to Transmit Diseases.” General Dentistry 59 (2): 100–107.
Kemp, Connor. 2019. Characterization of Woodwind Instrument Reed (Arundo donax L) Degradation and Mechanical Behaviour. PhD diss., McGill University. https://escholarship.mcgill.ca/downloads/z603r295j.pdf.
Marshall, Bonnie M., and Stuart B. Levy. 2011. “Microbial Contamination of Wind Instruments.” International Journal of Environmental Health Research 21 (4): 275–285. https://doi.org/10.1080/09603123.2010.550033.
Mobley, J., and C. Bridges. 2015. “Wind Ensemble Infectious Disease Risks: A Microbiological Examination of Water Key Liquids in Brass Instruments.” Texas Public Health Journal 67 (2): 16–18.
Mobley, J., and C. Bridges. 2016. “Wind Ensemble Infectious Disease Risks II: A Microbiological Examination of Condensate Liquids in Woodwind Instruments.” Texas Public Health Journal 68 (4): 6–10.
Taillard, Pierre, John Smith, and Joe Wolfe. 2012. “Vibrational Modes of the Clarinet Reed: Implications for Sound Production.” Acta Acustica united with Acustica 98 (4): 543–557. https://doi.org/10.3813/AAA.918540.
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