Making hemp yarn starts with separating the strong bast fibers from the woody core of the hemp stalk, then processing those fibers until they’re soft and fine enough to twist into a continuous strand. The full process moves through four main stages: retting, fiber extraction, preparation, and spinning. Each stage shapes the quality of your final yarn, and the choices you make (especially during retting) determine whether you end up with coarse cordage or something soft enough for woven fabric.
Understanding the Raw Fiber
Hemp’s usable fibers sit in the outer bark (bast) of the stalk, surrounding a woody inner core called the hurd. These bast fibers are mostly cellulose, typically 57% to 77%, which is what gives them their exceptional strength. The rest is a mix of hemicellulose (9% to 14%) and lignin (5% to 9%). Lignin is the compound responsible for hemp’s natural stiffness, and much of the processing that follows is about reducing it so the fibers become pliable enough to spin.
The fibers are bound to the stalk and to each other by pectin, a natural plant glue. Before you can spin anything, that pectin needs to break down so the fibers release cleanly. This breakdown process is called retting, and it’s the most important step in the entire chain.
Retting: Breaking Down the Plant Glue
Retting uses microorganisms or water to dissolve the pectin holding fibers to the stalk. You have two main options: dew retting and water retting. Each produces different quality fiber on very different timelines.
Dew Retting
This is the simplest method and requires no equipment. After harvest, you spread the hemp stalks flat on the ground, typically in a field or lawn, and let naturally occurring fungi do the work. Species like Cladosporium and Mucor colonize the stalks, and their root-like structures penetrate the stem and release enzymes that dissolve the pectin.
The ideal conditions are temperatures around 15 to 20°C (59 to 68°F) with about 60% humidity. Under those conditions, European growers typically see retting complete in 28 to 41 days. If the weather turns cold or dry, the timeline stretches considerably. At an average temperature of 11.5°C with low rainfall, the process can take up to 70 days. You’ll need to turn the stalks every few days so both sides ret evenly. The fiber is ready when it pulls away from the woody core without much resistance.
The downside of dew retting is inconsistency. Weather is unpredictable, and different sections of the same spread can ret at different rates, producing uneven fiber quality. Bacterial growth during the process can also discolor the straw, turning it light and creamy, while sun exposure without enough moisture causes a rust-colored tone.
Water Retting
Water retting produces finer, more uniform fiber but requires more hands-on work. You submerge bundled stalks in a pond, stream, tank, or even a large plastic tub. Bacteria in the water ferment the pectin and separate the woody parts from the fiber.
Cold water retting (in a pond or stream at ambient temperature) takes the longest. Warm water retting at around 30°C (86°F) speeds things up dramatically. In controlled experiments, hemp stalks retted in warm water at a ratio of 1 kilogram of stalks per 10 liters of water took about 144 hours, roughly six days. You’ll know the retting is complete when you can peel a fiber bundle cleanly from the stalk with your fingers. Over-retting weakens the fibers, so check daily once you pass the halfway mark.
If you’re working at home, a large plastic storage bin or stock tank works fine for warm water retting. Weigh down the bundles so they stay submerged, and change the water if it becomes excessively foul. The runoff is nutrient-rich but can smell strong, so plan accordingly.
Extracting and Cleaning the Fiber
Once retting is complete, dry the stalks thoroughly. The next step is breaking and scutching, which separates the bast fiber from the hurd. Breaking means cracking the woody core into small pieces, traditionally done by bending the stalks over a wooden brake (a hinged blade on a stand) or simply snapping them by hand along their length. Scutching is the follow-up: you scrape or beat the broken stalk with a wooden blade to knock away the hurd fragments and free the long fiber strands.
After scutching, you’ll have rough handfuls of long fiber called “line” fiber, plus shorter tangled bits called “tow.” Line fiber is what you want for smooth yarn. Tow can be saved for rougher cordage or blended in later. At this point, comb (or “hackle”) the line fiber through a bed of upright metal tines, starting with widely spaced tines and moving to finer ones. This aligns the fibers in parallel, removes remaining hurd bits, and separates fiber bundles into thinner ribbons ready for spinning.
Degumming for Softer Yarn
Even after retting, hemp fibers retain some lignin and residual pectin that make them stiff. If you want yarn soft enough for clothing or knitting, you’ll need a degumming step to strip away more of these non-cellulose components.
The simplest home method is an alkaline soak. Simmering the fibers in water with washing soda (sodium carbonate) for several hours dissolves much of the remaining lignin and pectin. Hemp has more lignin than some other bast fibers like ramie, so a gentler “semi-degumming” approach often works better than trying to strip everything out. Aggressive degumming can weaken the fibers and cause them to fall apart during spinning.
On the industrial side, enzymatic treatments using specific pectin-dissolving enzymes are effective but energy-intensive. Newer green solvents made from compounds like choline chloride and urea can achieve over 90% cellulose retention while removing nearly all the lignin at moderate temperatures. These aren’t practical for home processing, but they explain why commercially degummed hemp fiber feels so different from what you can achieve in a kitchen pot.
Spinning Hemp Into Yarn
Hemp can be spun on a drop spindle or a spinning wheel using techniques similar to those for flax (linen). The two approaches are dry spinning and wet spinning, and the choice makes a noticeable difference in the finished yarn.
Dry Spinning
Dry spinning means drafting and twisting the fiber as-is. This is the easier method to start with. You pull a thin ribbon of hackled fiber from a distaff (a vertical holder that keeps your fiber supply organized) and twist it with your spindle or wheel. Dry-spun hemp yarn tends to be hairier and slightly rougher, with more loose fiber ends poking out from the strand. It works well for twine, weaving warp, and textured projects where softness isn’t the priority.
Wet Spinning
Wet spinning produces smoother, finer yarn. Before drafting, you soak the fiber in warm water, which softens the remaining pectin and allows the individual fibers to slide past each other more easily. Many spinners keep a small bowl of water nearby and run their fingers through it while drafting, or wrap the fiber supply in a damp cloth. The moisture lets you draw the fibers thinner and tighter, producing a yarn with fewer stray ends and a slight sheen that develops further after the yarn dries and is washed.
For either method, hemp generally wants more twist than wool. Its fibers are smooth and don’t grip each other the way animal fibers do, so a higher twist angle holds the yarn together. Start with a firm singles yarn, then ply two or more singles together in the opposite direction for a balanced, strong finished yarn.
Finishing and Softening the Yarn
Fresh hemp yarn is stiff. This is normal and temporary. The traditional finishing process involves several rounds of washing and beating. Soak your skeins in hot water with a mild alkali like washing soda, then rinse and physically work the yarn by kneading, wringing, or gently pounding it. Each cycle breaks down a little more lignin and loosens the fiber structure.
Some spinners boil their hemp yarn for 20 to 30 minutes, which accelerates the softening. Others let it soften gradually through use and repeated laundering, which is how hemp textiles have traditionally been broken in. Hemp is unusual among natural fibers in that it gets softer with age rather than wearing out. The lignin that makes it stiff initially continues to break down slowly over time with washing and handling.
If you want to speed things up, a mechanical approach works too. Running the yarn through a simple wooden mangle or repeatedly stretching and snapping the skein between your hands breaks rigid fiber bundles into softer, more flexible strands.
Water Use and Environmental Considerations
One reason hemp yarn appeals to fiber crafters is its relatively low environmental footprint. Hemp grows without heavy irrigation in most climates, and its water footprint during processing is meaningfully smaller than cotton’s. Research comparing the two found that cotton fabric requires more than three times the industrial water that hemp fabric does. Cotton processing uses roughly 250 to 350 liters of water per kilogram of fabric, while hemp falls well below that range, even accounting for water retting.
If you’re retting at home, the water from your retting tank is high in organic matter. It’s not toxic, but it shouldn’t go into storm drains or waterways. Dilute it and use it to water non-edible plants, or let it dry out and compost the residue.