Peat-free and peat-reduced growing media (coir, wood fibre, composted bark, green-waste compost, sphagnum farming) instead of extracted peat

Replaces: peat in growing media · Scope: nurseries, greenhouses, retail compost · Evidence: high

The chemical problem#

• Professional and retail growing media are still dominated by peat, extracted from drained bogs in Northern Europe, the Baltics, Russia and Canada.
• Drained and extracted peatlands emit CO₂ for decades; peatlands store more carbon than all the world’s forests combined despite covering a small share of land.
• Policy: England has committed to ending peat sales in retail growing media (legislation pending); Germany, Ireland and others have reduction targets; retailers set their own phase-outs.

Product overview#

1. Coir (coco peat, coir pith, chips) — coconut-husk by-product from South and Southeast Asia; washed/buffered to remove salts.
2. Wood fibre — defibrated softwood chips; light, open structure, used up to 30–50 % in mixes.
3. Composted bark — from sawmills; stable, disease-suppressive.
4. Green-waste compost — quality-assured compost (5–30 % of mixes).
5. Sphagnum farming — cultivated sphagnum moss biomass on rewetted peatland (renewable, early commercial).
6. Other — rice hulls, biochar fractions, perlite (mineral).

Active ingredient / Composition#

Key facts#

Advantages#

• Keeps peatland carbon in the ground.
• Uses by-products (coconut husk, sawmill residues, green waste).
• Composted bark and compost add disease suppression.
• Meets retailer and policy demand for peat-free products.

Mode of action#

• Coir holds water but drains differently from peat; wood fibre and bark provide air space.
• Composts supply microbes that compete with root pathogens (Pythium, Phytophthora).
• Wood fibre locks up N during microbial breakdown → extra N feeding needed.

Application#

Limitations#

• Different water and nutrient behaviour requires grower retraining.
• Coir needs washing and buffering (Na, K) and long-distance shipping.
• Wood fibre’s N immobilization and compost’s salt variability need quality control.
• Some propagation uses still lack a full peat replacement.

Evidence of displacement — D3: proven displacement at scale#

Assessment (hand-reviewed): National: peat share in German potting soils fell from 59% to 33% (2019–2024).

Verified figures (the number is in the quoted sentence and the sentence is on the source page):

• displacement — In Germany, the average peat content in potting soils for hobby gardening decreased from 59% in 2019 to 33% in 2024. (Germany, 2019-2024; peer-reviewed: sciencedirect.com)
• displacement — In the UK professional sector, peat use fell from 62.3% of volume in 2020 to 51.7% in 2021, with the actual volume of peat used falling from 0.63 million cubic metres in 2021 to 0.46 million cubic metres in 2022. (UK, 2020-2022; weak: projectbluearchive.blob.core.windows.net)
• displacement — Peat usage among UK growers and plant producers fell to 21.8% in 2025, down from 34.4% in 2024 and 39.5% in 2023. (UK, 2023-2025; weak: hta.org.uk)
• displacement — In the UK, peat usage among growers and plant producers fell to 21.8% in 2025, down from 34.4% in 2024 and 39.5% in 2023. (UK, 2023-2025; weak: hta.org.uk)

Suppliers — real products and services (from the vendor index)#

Active vendors whose own card shows non-peat growing-media constituents. Companies selling peat moss (e.g. Rana Agro-Industry, Gulf Palms) are the incumbent product and are deliberately not cited.

Still missing: wood-fibre and composted-bark substrate makers. Not cited: Abtec (“soilless potting mix”, composition not stated) and Martin Dale Seedlings (sells peat moss as well as coir).

Government funding signals#

Scanned 2026-10-01 (OpenAIRE + NSF); candidates reviewed by hand.

Signal: Strong. A UK industrial-strategy cluster: Innovate UK/ISCF 10053549 (peat-free blocking media, £226 k), 10095362 “Peat-Free+” (recycling cropping substrates, £186 k), 10003816 (recycling coir, £108 k), 71977 “Sphagnum Farming UK” (£365 k), 10027838 “Growing Media for the Future” (sphagnum, £379 k) and 10106787 (wool waste for peat-free media).

Scientific evidence#

• Gruda NS (2019). Increasing sustainability of growing media constituents and stand-alone substrates in soilless culture systems. Agronomy 9: 298.
• Barrett GE, Alexander PD, Robinson JS, Bragg NC (2016). Achieving environmentally sustainable growing media for soilless plant cultivation systems – a review. Scientia Horticulturae 212: 220–234.
• Leifeld J, Menichetti L (2018). The underappreciated potential of peatlands in global climate change mitigation strategies. Nature Communications 9: 1071.

Bioeconomy value#

Peat replacement is a substitution driven by retailers and climate policy, and it runs on coconut, sawmill and green-waste by-products. Russia and the Baltics are major peat producers, so the territory decision shapes whether this is an opportunity or a threat.