Herbal Ley for Horses: SAM3 & GS4 Options for Healthy, Laminitic and Metabolic Horses

Can Horses Graze a Herbal Ley?

Most herbal ley seed mixes are actually designed for livestock systems, even if they are technically suitable for horses. These mixes often target UK agricultural schemes such as the Sustainable Farming Incentive and Countryside Stewardship Scheme, including the SAM3 Herbal Ley and GS4 Herbal Ley.

They are designed to improve soil health, biodiversity, and forage production. But are they suitable for horses, especially laminitic or metabolic-prone individuals?

The answer: Not always. Most herbal leys are formulated for improving soil and feeding cattle or sheep, not our equines.

What Is a Herbal Ley?

A herbal ley is a multi-species pasture combining:

• grasses

• legumes

• herbs and wildflowers

  
  

The goal of typical agricultural herbal leys is to improve soil structure, fertility, and forage yield. While this works well for livestock, horse grazing needs a different ecological and nutritional approach, one that prioritises soil structure, species diversity and forage nutrition, with low energy, low sugar and high fibre species being prioritised over yield.

Why Standard Herbal Leys Can Be Risky for Horses

Horses, especially those with laminitis or equine metabolic syndrome (EMS):

• graze selectively

• apply high hoof pressure to pastures

• are sensitive to high non-structural carbohydrates (NSC) such as sugars and fructans

Many SAM3 or GS4 mixes contain only 6–10 species, including highly productive grasses that can spike sugar levels, increasing laminitis risk if grazed freely.

Why Biodiversity Matters for Horse Pastures

Multi-species pastures:

• Broaden nutrient profiles and encourage foraging

• Reduce NSC spikes by balancing plant types

• Increase ecological resilience and drought tolerance with different root depths

  
  

Traditional UK meadows often contained no less than 20% wildflowers, with some meadows hosting  30–40 species per square metre (Plantlife), supporting both soil health and horse grazing needs. Modern species-poor pastures fail to provide the benefits of these old wildflower meadows.

Comparing SAM3 Herbal Leys and the Biodiverse Grazing Mix for Horses

Feature	Typical SAM3 / GS4 Herbal Ley (Livestock Focus)	Biodiverse Grazing Mix for Horses (Hoof and Habitat)
Number of species	~6–10	20+
Plant types	Mainly productive grasses + a few legumes and herbs	Grasses, legumes, herbs, wildflowers, species selected for horse nutrition and long term grazing resilience
Sugar / NSC profile	High during spring growth, designed for livestock yield	Lower, more balanced, designed to support healthy horses
Soil / ecological function	Improved fertility and productivity	Supports soil structure, organic matter, biodiversity, and drought resilience. Doesn't rely on fertilisers
Grazing suitability	Optimised for sheep/cattle	Optimised for horses, and suitable for good doers, EMS and laminitic prone (always manage grazing carefully)
Scheme compatibility	SAM3 / GS4 / SFI / Countryside Stewardship	SAM3 / GS4 / SFI / Countryside Stewardship, eligible for horse-owning land use
Management	Often intensive, quick regrowth focus	Designed for selective grazing, minimal soil compaction, mixed plant heights
Outcome for horses	Can trigger metabolic issues if grazed freely	Supports healthier grazing patterns, more stable NSC intake (no seed mix completely removes risk of obesity or laminitis- manage grazing carefully)

Can Horses Graze a Herbal Ley Under SFI or Countryside Stewardship?

Yes — but the choice of seed mix is critical.

Landowners who run liveries, rent grazing to horse owners, or keep horses on their land may qualify for CSAM3 or CGS4 herbal ley options. However, most mixes marketed for compliance are designed for livestock and contain too few species for horse health. 

Horses require a balanced pasture ecosystem to reduce laminitis risk and support long-term health and wellbeing.

A Horse-Specific Herbal Ley: Biodiverse Grazing Mix for Horses

The Biodiverse Grazing Mix for Horses was developed as a horse-appropriate herbal ley:

• Over 20 species of grasses, legumes, herbs, and wildflowers

• No less than 20% Wildflowers, Herbs and Legumes

• May reduce risk of sugar spikes for laminitic and EMS-prone horses

• Compatible with SAM3 / GS4 / Countryside Stewardship for eligible horse-owning land

• Designed to improve soil health, climate resilience, and grazing stability

  
  

This mix is ideal for landowners seeking the benefits of herbal leys while supporting equine welfare.

The Key Takeaway

The UK is seeing increasing interest in species-rich pastures for horses.

• Standard herbal leys are often unsuitable for horses

• Pasture diversity reduces risk and improves long-term resilience

• Horse-specific herbal ley mixes can qualify for SFI/Countryside Stewardship schemes while providing ecological and metabolic benefits

  
  

Horse owners and land managers now have the opportunity to combine regenerative land practices, biodiversity, and horse welfare in one system.

Next Steps for Landowners

1. Check if your land qualifies for SAM3 / GS4 herbal ley options

2. Use a horse-specific, biodiverse, herbal ley mix rather than a livestock herbal ley

3. Implement grazing management, reduce soil compaction, and allow pasture recovery

4. Monitor NSC levels and manage turnout for laminitic-prone horses