Control is best obtained during the first year. Perennials live for more than two years. They reproduce vegetatively from roots, rhizomes, buds, or tillers, or from seed, or both. They can be especially difficult to control because of their persistent root systems. Several weed control options are available.
Prevention is the most practical and economical form of weed control.
Be alert for new weeds on your farm, so they can be controlled before they become a serious problem. Cultural control may utilize techniques such as proper grazing management, good soil fertility practices, proper drainage, rotation and choosing good competitive crop varieties to encourage maximum crop competition. Biological control is the control of weeds with plant pathogens or insects. Several of our most troublesome pasture weeds can be controlled with this method. For example, tansy ragwort is controlled by the cinnabar moth.