Weed control without chemicals is a viable option. However, there are a number of factors to consider. This is an easy question to answer in a monoculture such as corn or soybeans, but is more difficult in a pasture. In grain crops, weeds often reduce yields and therefore profits. In pastures, the most undesirable traits a plant may have are that it is poisonous or not consumed by animals.
Some examples are buttercups, thistles and woody species.
Other species we consider as weeds in pastures are those that exhibit low productivity or are productive for only a short time during the summer. Some examples like dandelions and wild plantains are perennials and others are annual weeds like foxtail and ragweed. Whatever the weed problem, sound production practices are the key to controlling them without chemicals. The time to begin your weed control strategy is in the establishment phase. If weeds are not controlled at the outset, they may choke out a new seeding or allow weeds to encroach into the established stand.