NEXGROW brand dormant and non-dormant alfalfa varieties with the Roundup Ready® trait are the answer to early weed problems. To maximize the benefits of Roundup Ready alfalfa, apply glyphosate to seedling alfalfa at the 3 to 5 trifoliate stage, when weeds are less than 4 inches tall. If weed problems persist, an additional application of glyphosate can be made up to 5 days prior to harvest.