Broadleaf cattail has a widespread presence across various continents, with native populations flourishing in broad temperate and subtropical regions. This species is also cultivated, further expanding its reach. While naturally expansive, broadleaf cattail has introduced populations in select major regions, enhancing its global footprint. Certain areas consider the plant somewhat assertive in its new terrains, where it is thought to have an impact on local ecosystems. Despite this, its cultivation continues, underscoring the balance between broadleaf cattail's ecological adaptability and management practices.

Broadleaf cattail originates from the Northern Hemisphere, specifically North America and Asia. It's often considered a weed because it possesses certain traits that enable it to spread rapidly and overtake other plant species. One such characteristic is its robust reproductive ability. Not only can it produce thousands of wind-dispersed seeds per plant, but it can also propagate through its rhizomes - long, horizontal stems that grow underground. This means it can rapidly colonise a large area, pushing out native species and disrupting biodiversity. Its tall and dense growth also tend to block sunlight, making it hard for other plants to survive. Should you choose to grow it in your garden, it's important to keep an eye on its rapid spread. It primarily spreads by its rhizomes and seeds, so regular monitoring and restricting its growth to certain areas would be essential to prevent an unwanted takeover.

The best time to manage or remove broadleaf cattail is before it sets seed in late summer to early fall. This prevents the spread of seeds, which can lead to further colonization.