In Southeast Michigan where I live the Flowering Rush are invasive plants that tend to cause problems for the native plant life.  I really like the flowers.

Flowering rush (Butomus umbellatus) is a perennial aquatic plant native to Europe and Asia, commonly found in shallow waters, wetlands, and along the edges of lakes and rivers. It features slender stems that can reach up to 3-4 feet, long narrow leaves, and attractive pink to white flowers that bloom in umbrella-like clusters during late spring to early summer.

While it supports local wildlife by providing habitat and attracting pollinators, flowering rush can become invasive in non-native regions, outcompeting local flora and disrupting ecosystems. Management strategies, such as mechanical removal or chemical treatments, may be necessary to control its spread.

Despite its invasive potential, flowering rush is popular in ornamental gardening for water features and naturalized areas. Careful management and awareness of local regulations are important to enjoy its beauty while minimizing ecological impact.