Exploration Research
The Chemistry of Lomandra: Plant Polymers and Indigenous Engineering
For thousands of years, the First Peoples of Victoria have understood what modern materials science calls polymer chemistry — the behaviour of natural fibres under heat, water, and stress. One of the most important plants in this knowledge system is Lomandra longifolia, known in many southern languages by regional names including dharra on Wadawurrung Country. Lomandra was used to make rope, nets, mats, and baskets, but its preparation reveals a remarkable understanding of molecular structure, water chemistry, and mechanical resilience — principles now studied in laboratories but long practised on Country.
The Plant Polymer: Cellulose, Hemicellulose, and Lignin
All vascular plants, including Lomandra, owe their structure to three major biopolymers:
1. Cellulose — strong, crystalline chains of glucose that provide tensile strength.
2. Hemicellulose — a softer matrix that binds cellulose bundles and gives flexibility.
3. Lignin — a hard, waterproof polymer that fills cell walls, providing rigidity and decay resistance.
When freshly cut, Lomandra leaves are stiff because lignin locks cellulose strands in place. Over time, this makes the fibres brittle. Indigenous weavers learned through observation that by soaking, scraping, and heating the leaves, these polymers could be modified to produce fibre that was flexible yet strong.
This was not random trial and error — it was applied chemical engineering guided by ecological observation.
Soaking: Water as a Solvent and Catalyst
Soaking Lomandra leaves softens them not simply by hydration but by chemical alteration.
When submerged, water enters microscopic pores, displacing air and partially dissolving hemicellulose and pectin — the glue-like substances that bind fibres together. The slightly acidic water of wetlands (low pH from tannins and organic matter) enhances this reaction, gently breaking bonds within the leaf matrix.
After several hours or days, depending on the season, the leaves become supple enough to twist without fracturing. This practice mirrors the retreatment process now used in industrial textile preparation, where water and mild acidity are applied to make plant fibres pliable for spinning.
Traditional weavers timed soaking according to water temperature and smell, indicators of microbial and chemical readiness — a deeply empirical science of water chemistry (Australian National Botanic Gardens, n.d.; Fibre Artists Network, n.d.).
Scraping: Mechanical Separation of Fibre Bundles
Once soaked, the leaves were scraped with shell or stone tools to remove the waxy cuticle and fibrous outer sheath.
This physical action separated the underlying cellulose bundles into strands suitable for twisting or weaving.
Scraping also removed residual lignin layers that could cause the fibre to harden again when dry.
By removing these layers, the tensile strength of the fibre increased, while flexibility improved. The process aligned with what modern material scientists call fibrillation — the isolation of microscopic fibre units that can bear tension evenly.
If not scraped properly, the leaf would crack or shear when woven, demonstrating an acute Indigenous understanding of microstructure and mechanical stress.
Drying, Re-dampening, and Heat Treatment
After soaking and scraping, Lomandra strands were dried in the sun, then re-dampened when needed.
This drying and rehydration cycle altered internal moisture equilibrium, stabilising fibre tension — similar to modern “annealing” used in composites and textiles to prevent warping.
In some cases, fibres were gently warmed over coals or near fire. Heat loosened lignin further and sterilised the fibre against fungal decay, extending the life of the rope or basket.
These treatments, while simple in appearance, demonstrate a profound mastery of thermodynamics and polymer behaviour.
Indigenous Engineering Principles in Fibrecraft
The preparation of Lomandra fibre reveals several key engineering concepts long recognised in Indigenous science:
Modern Scientific Concept
Indigenous Practice
Polymer softening through hydration
Soaking Lomandra in wetlands or rivers to loosen lignin and hemicellulose
Mechanical separation (fibrillation)
Scraping away outer cuticle to expose inner cellulose fibres
Thermal conditioning
Passing fibres near low fire to stabilise and harden structure
Elastic equilibrium
Drying and re-dampening fibres for long-term flexibility
Ecological sustainability
Harvesting post-fire regrowth for optimal fibre quality and regrowth cycles
Each step was governed by observation — not laboratory instruments but lived experiment, encoded through story, rhythm, and repetition.
Wadawurrung Knowledge and Practice
On Wadawurrung Country, fibre preparation was woven into everyday life and ceremony.
Lomandra dharra was gathered from creek lines, wetlands, and volcanic plains. Women selected young, unflowered leaves for their pliability, understanding that older leaves had higher lignin content.
Water from Barwon River and Lake Connewarre was preferred for soaking due to its tannin-rich chemistry, which acted as a natural softener.
Through language, song, and teaching, these methods were preserved and passed on. The act of scraping, twisting, and binding fibres symbolised connection — of hands to Country, and of structure to story.
Today, Wadawurrung weavers continue this practice, merging ancient chemistry with contemporary art and environmental restoration, teaching that every fibre carries ecological law.
Legacy and Scientific Recognition
Modern materials scientists studying plant composites and biopolymers now recognise similar methods — soaking to adjust lignin bonds, scraping for fibre extraction, heat treatment for durability.
Yet these “discoveries” reflect processes Indigenous women mastered thousands of years ago through observation, patience, and care for living systems.
This is science embedded in culture — not reductionist but relational, seeing chemistry as part of a network of ethics, ecology, and survival.
The preparation of Lomandra is thus both an innovation in polymer chemistry and an act of custodianship. It shows that the scientific frontier was always here — in the wetlands, in the hands of the fibre workers, and in the songs that hold their knowledge.
Conclusion
Lomandra’s transformation from grass to fibre reveals how Indigenous engineering operated at a molecular and ecological scale.
Through soaking, scraping, drying, and weaving, Victoria’s First Peoples manipulated plant polymers with precision equal to modern materials science — but guided by relationship rather than extraction.
For the Wadawurrung, this practice continues as both chemical and cultural alchemy — binding the molecular to the spiritual, and showing that the strength of a fibre, like a community, lies in its interconnection.
References
· Australian National Botanic Gardens (n.d.) Aboriginal Plant Use: Lomandra longifolia. Available at: https://www.anbg.gov.au/aborig.s.e.aust/lomandra-longifolia.html (Accessed: 8 September 2025).
· Blake, B.J. (1991) Wathawurrung and the Colac Languages of Southern Victoria. Canberra: Pacific Linguistics.
· Caroline Hawkins (n.d.) Coiling with Lomandra and Budj Bim Eel Traps. Available at: https://www.carolinehawkins.com.au/coiling-with-lomandra.html (Accessed: 8 September 2025).
· CAUL OER Collective (n.d.) Engineering with Country: Materials and Strength. Available at: https://oercollective.caul.edu.au/engineering-with-country/chapter/materials-and-strength/ (Accessed: 8 September 2025).
· Fibre Artists Network (n.d.) Weaving with Natural Plant Fibres. Available at: https://www.fibreartistsnetwork.org.au/weaving-with-natural-plant-fibres/ (Accessed: 8 September 2025).
· Fibrenell (2016) Fibrecraft of Indigenous Australia. Available at: https://fibrenell.blogspot.com/2016/12/fibrecraft-of-indigenous-australia.html (Accessed: 8 September 2025).
· Survive Australia (n.d.) How To Make Cordage from Mat Rush (Lomandra). Available at: https://www.survive.au/cordage_lomandra.php (Accessed: 8 September 2025).
Written, Researched and Directed by James Vegter 16/09/2025
Magic Lands Alliance
Sharing the truth of Indigenous and colonial history through film, education, land and community.
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Magic Lands Alliance acknowledge the Traditional Owners, Custodians, and First Nations communities across Australia and internationally. We honour their enduring connection to the sky, land, waters, language, and culture. We pay our respects to Elders past, present, and emerging, and to all First Peoples communities and language groups. This article draws only on publicly available information; many cultural practices remain the intellectual property of communities.