Retting Explained: How Bast Fibres Begin Their Journey to Cloth

CULM · 28 Aug 2026

Retting is one of the early steps used to help separate useful bast fibres from the surrounding plant stem. It is important in materials such as flax and hemp because the textile fibre sits within a larger biological structure.

Why is retting needed?

The long fibres used for spinning are held together with pectins and other plant materials. Retting helps break down some of those binding materials so later mechanical processing can separate and clean the fibre more effectively.

Is there only one retting method?

No. Retting can be carried out in different ways depending on region, crop, weather, infrastructure and desired fibre quality. Traditional and industrial approaches can use moisture, microbial activity, controlled processing or combinations of methods.

Does retting affect the final fabric?

It can. Early fibre preparation influences cleanliness, colour, fibre length and consistency. Those factors then affect spinning, yarn formation and the appearance of the finished cloth.

Why does this matter to a clothing customer?

Because the material story begins long before weaving. A composition label tells you what fibre is present, but it does not describe every transformation between field and garment. Understanding retting is one way to see why traceability matters.

Is retting the same as spinning?

No. Retting prepares the plant material for fibre separation. After that come further stages such as breaking, scutching, hackling or comparable cleaning and alignment processes, followed by spinning into yarn and then weaving or knitting into cloth.

To place retting in context, read our guide to bast fibres and what clothing traceability means.

For CULM, this is what “grown, not made” points toward: cloth begins as material with a history, not as a finished product appearing from nowhere.