Fiber & processing
What is retting and why is it important in hemp fiber production?
Direct answer
Retting is controlled decomposition that separates bast fiber from the stem’s woody core—field (dew) retting and water retting are the classics. Under-retting yields tangled, weak fiber; over-retting destroys strength. It is one of the least discussed—and most decisive—steps in hemp fiber quality.
What retting does in plain language
After cutting, hemp stalks are not yet “fiber” in the textile sense. Microbes break down pectins that bind bast bundles to hurd. Done well, you get separable long fibers; done poorly, you get brittle straw and discounts.
Dew retting vs water retting
Dew retting lays windrows in the field and relies on moisture and native microflora—cheap but weather-risky. Water retting tanks or ponds speed the process with more control and environmental permitting concerns.
Field mistakes we see
- Turning rows too early—uneven retting.
- Confusing retting with dry-down; they are related but not identical.
- Shipping wet bales before stability—heating in transit.
Your next steps
- Retting is biology, not a calendar date—weather drives outcomes.
- Buyers judge fiber by retting outcomes more than by seed brand.
- Very little high-quality public guidance exists; this page is meant to fill that gap.