No other pasture legume now available compares with birdsfoot trefoil in abiliity to withstand continuous grazing once it is established. Trefoil does, however, need more attention than other legumes in getting established. Here are some tips from Iowa State College agronomists.
Scholl, J. M. and Thompson, H. E.
"Best Legume for Permanent Pasture,"
Iowa Farm Science: Vol. 10
, Article 2.
Available at: https://lib.dr.iastate.edu/farmscience/vol10/iss1/2