Quick answer: Retting is the controlled breakdown that helps separate fiber from the woody core. In field retting, weather and timing are everything—turning swaths helps retting happen evenly so fiber quality is consistent.
Key takeaways
- Retting is quality control: under‑retted and over‑retted fiber both reduce value.
- Evenness matters: turning can help prevent “good on top, bad underneath.”
- Weather runs the schedule: plan for humidity/rain cycles in your region.
- Don’t guess: check progress regularly and record what worked.
What retting does
Retting loosens the bonds that hold bast fiber to the stalk. The goal is separation without damaging fiber strength and length.
Field retting: what controls the process
- Moisture and humidity
- Temperature
- Swath thickness and contact with the ground
- Turning frequency and equipment
When to turn
Turn when the underside is retting differently than the top, or when conditions are creating uneven progress. The exact schedule is local—what matters is monitoring and consistency.
Common problems
- Over-retting: weak, broken fibers
- Under-retting: difficult separation during processing
- Uneven retting: mixed quality and inconsistent outputs