Wool

Wool as a soil material

Wool has been used in gardens and fields for generations. Long before manufactured fertilisers, growers returned fleece and wool waste to the soil to support crops over time.

High-quality wool was reserved for clothing and textiles, while lower grade wool, like belly wool, dags, and short or soiled fleece had a different, practical role. Rather than being wasted, this wool was returned to the land where it came from, quietly supporting plant growth.

Understanding low grade wool

Low grade wool refers to fleece that is too short, dirty, or contaminated to be made into textiles. The British Wool grading system judges fleece on staple length, fineness (micron), crimp, handle, and cleanliness. In total, British Wool sorts fleece into around 100–120 different grade types based on these characteristics, each identified with a grade number that reflects its style and quality.

This often includes:


  • Belly wool, shorter and coarser than the main fleece

  • Dags, clippings removed for hygiene and animal welfare

  • Fleece contaminated with straw, soil, or vegetable matter

Even though it isn’t suitable for textiles, low grade wool retains the natural properties that make it valuable for soil, like slow breakdown and moisture retention.

How wool supports soil and plants

Historically, low grade wool was worked directly into growing systems. Common uses included:

  • Adding it to compost heaps
  • Laying it in bean furrows before planting
  • Working it into potato ridges
  • Using it as a mulch around plants

Wool breaks down slowly, holding moisture and releasing nutrients over time. As it decomposes:

  • Nutrients are gradually released
  • Soil biology is supported
  • Moisture is held around plant roots
  • Soil structure improves

Rather than forcing rapid growth, wool supports plants quietly, working in harmony with natural soil biology.

Wool in modern growing and Wooltiliser

Today, much wool loses its traditional role, but its properties remain unchanged. In our growing system, we treat wool as a practical soil material, not a waste product. Returning it to the soil helps us:

  • Cycle nutrients and organic matter back into the land
  • Work with soil biology instead of artificial chemicals
  • Improve soil gradually for long-term fertility

Wool also forms the foundation of Wooltiliser, which is designed to:

  • Build soil health over time
  • Provide long-acting background nutrition
  • Support moisture retention and soil biology

Applied once per year as a foundation input, Wooltiliser doesn’t push plant growth it supports the soil that grows them.