What is a multi-species sward and is it right for your farm?

Multi-species swards include a range of clovers (legumes), herbs and grasses, with many different mixes and options available. A well-balanced multi-species sward includes species from all three groups, each contributing differently to system performance and resilience. 

Multi-species leys differ from species-rich grassland as they contain sown productive species in temporary grassland. 

Grasses drive production and yield and provide structural integrity and persistent ground cover. 

Common species include: 

• Perennial and Italian rye-grass 
• Festuloliums 
• Timothy 
• Cocksfoot 
• Meadow and tall fescue 

Legumes improve soil fertility and reduce the need for artificial fertilisers. They also offer high-protein forage, with a different concentration of minerals (compared with grass). 

Common species include: 

• White, red and alsike clover 
• Lucerne 
• Sainfoin 
• Bird's-foot trefoil 

Herbs tend to have more complex rooting structures than grass, which supports soil structure and drought resilience. 

Common species include: 

• Chicory 
• Ribwort plantain 
• Burnet 
• Yarrow 

Well-designed multi-species swards support biodiversity both above and below ground. 

Flowering legumes and herbs provide nectar and pollen for pollinators as well as habitats for predatory insects and parasiticides that support natural pest control. 

Multi-species swards can significantly increase: 

• Earthworm populations 
• Pollinator abundance 
• Beneficial invertebrates 
• Seed-eating farmland birds on legume-based leys 

This enhances ecosystem services, reduces pest pressure and strengthens the overall resilience of the farming system. 

Multi-species swards offer a variety of benefits compared with less diverse grass-only systems. 

• Nitrogen fixation from legumes reduces dependence on artificial fertilisers 
• Increased organic matter from diverse root systems improves soil structure, porosity and water infiltration 
• Enhanced microbial activity supports long-term soil fertility 

• Deep-rooting species such as chicory, lucerne and sainfoin improve drought tolerance 
• Diverse swards reduce vulnerability to disease and pest outbreaks 
• Some herbs contain bioactive compounds that may help reduce parasite burdens 

• Multi-species swards can extend the grazing season by offering steady growth across spring, summer and early autumn 
• Performance is more stable in variable weather conditions compared with monoculture leys 

• Reduced fertiliser and pesticide inputs lower costs and emissions 
• Improved soil carbon storage supports climate change mitigation 
• Align with regenerative principles and agri environment objectives 

Before establishing a multi-species sward, it’s important to consider the benefits and challenges. 

• High-quality, protein-rich forage 
• Improved soil structure and water infiltration 
• Reduced reliance on artificial nitrogen 
• Potential improvements in animal health and resilience 
• Greater biodiversity and wildlife value 
• Useful break crop in arable rotations 

• Leys should ideally remain in place for at least three years to deliver soil benefits 
• They are more sensitive to high-nitrogen inputs 
• Careful nutrient and grazing management are required 
• Higher initial seed costs 
• More challenging weed control compared with rye-grass 
• Risk of selective grazing or milk taint if poorly managed 
• Shorter lifespan of some species 

• Are you willing to reduce artificial fertiliser use? 
• Can your system accommodate rotational grazing or longer rest periods? 
• Are you comfortable with yields and forage quality differing from rye-grass-only systems? 

Multi-species swards perform best where grazing can be controlled.  

Consider: 

• Can you operate longer rest periods? 
• Can livestock be managed to avoid selective grazing or poaching? 
• Is fencing and water infrastructure suitable for rotation? 
• Are gateways and access points robust enough? 
• Are machinery or cattle available to reset excess growth? 

Multi-species swards fit well into planned rotations: 

• As an arable break crop to rebuild soil structure and fertility 
• Following break crops in grass-to-grass reseeds 
• Through overseeding herbs and legumes into existing swards as a lower-cost entry point 

Overseeding can be a practical first step before committing to a full reseed.