The advent of glyphosate resistant crops has changed weed management practices in several cropping systems. Alfalfa, the “queen of forages” may also soon offer this attribute to producers. The development of glyphosate resistant alfalfa is well underway. Forage Genetics International and Monsanto anticipate marketing Roundup Ready alfalfa varieties in 2004. This is the first transgenic perennial agronomic crop with the gene for glyphosate resistance, and the dynamics of this trait in alfalfa are somewhat different than for annual crops like soybeans or corn.