Could two be better than many when it comes to sward species?

Multi-species swards typically include PRG, cocksfoot, Timothy, red and white clover, chicory and plantain herbs

There was also evidence PRG/white clover swards emitted less nitrous oxide emissions.

More research is needed to support the use of multi-species swards (MSS) on farms as a better alternative to a two-species mix of white clover and PRG, according to an independent report reviewing Teagasc research.

There was some evidence of potential environmental impacts, particularly reduced nitrogen losses. Further research on MSS is justified, according to Teagasc, with emphasis on quantifying environmental impacts and whether similar benefits can be obtained with a reduced number of species (for example, a simple perennial ryegrass, white clover, and plantain mix).