Multispecies herbal mixes are becoming increasingly popular among livestock farmers as a means of driving production and environmental gains (see "The numbers"). The benefits of these leys range from improved soil structure and drought resilience to greater biodiversity.Most mixes include perennial ryegrass (PRG), herbs such as plantain and chicory, and legumes including red and white clover. However, there is no set definition of a multispecies herbal ley, nor rules on what and how many species it should contain.
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