Mexican marigold originally hails from regions in South America but has since found a foothold across various continents, including Africa, Asia, and Europe. While mexican marigold is established in many areas outside its native range, it is sometimes thought to be competitive in certain ecosystems, notably in South America. In parts of Africa and Oceania, mexican marigold may have an impact on local plant communities. Its presence spans temperate to tropical climates, reflecting its adaptability.

Mexican marigold can cause dermatitis through skin contact and gastrointestinal distress (nausea, vomiting, diarrhea) if ingested. These symptoms are generally not life-threatening, but caution is advised for gardeners and those handling the plant. Avoid contact and ingestion to prevent adverse effects.

Mexican marigold originates from South America, specifically parts of Argentina and Chile. This plant is considered a weed primarily due to its aggressive growth habit, prolific reproduction, and pervasive spread. Visibly, mexican marigold is large and robust, suppressing other plant growth due to the release of allelopathic chemicals, which can compromise their growth and development. Its harmfulness extends to its ability to dominate landscapes, transforming diverse habitats into single-specie areas that can potentially displace native flora, disrupt biological diversity, and alter ecosystem functions. Mexican marigold generally spreads by seeds, which are easily disseminated by the wind, water, animals, or human activities. These seeds require minimal resources to germinate and can lie dormant in the soil for several years, enhancing mexican marigold's capacity to invade new territories.

The best season for removal of mexican marigold is during spring to early summer, before the plant gets to its flowering stage. Here are few methods of removal or control: