A weed is any plant deemed undesirable in a specific context due to conflicts with human preferences or needs. This designation is particularly relevant in agriculture, where weeds can significantly reduce crop yields. Characteristics that contribute to a plant being classified as a weed include being hazardous, aesthetically unappealing, or difficult to control. Invasive species, which negatively impact ecosystems, can also be considered weeds. The determination of whether a plant is a weed is thus situational and based on its impact within a given environment.
1905: Weeds viewed as a major public health hazard in St. Louis
In St. Louis, starting in 1905, weeds became viewed as a major public health hazard, believed to cause typhoid and malaria.
1910: Legal precedents set in order to control weeds in St. Louis
By 1910 in St. Louis, legal precedents were set in order to control weeds that would help facilitate the adoption of weed control laws throughout the country.
2023: 58 weed species have developed resistance to glyphosate
As of 2023, 58 weed species have developed resistance to glyphosate.
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