2025 Qualified Applicator License (QAL) Category F Aquatic Exam Prep

Waterhyacinth primarily reproduces vegetatively by stolons, which are horizontal stems that grow along the surface of the water. This method allows the plant to spread rapidly across water bodies, forming dense mats that can outcompete native vegetation and disrupt aquatic ecosystems. Each stolon produces new plants at nodes, stabilizing and increasing the population of waterhyacinth in a given area.

While waterhyacinth can also reproduce through seeds, this method is less common in many situations due to environmental factors that may inhibit seed germination and establishment. In contrast, vegetative reproduction through stolons is a highly effective strategy for the species, allowing quick colonization of available water areas. Other forms of reproduction, such as root division and cuttings, do not primarily contribute to its main mode of propagation compared to stolonal growth. Thus, the emphasis on vegetative reproduction accurately reflects waterhyacinth’s capacity for rapid expansion and ecological impact in freshwater environments.