Perennial herbs < 3 m tall. Surface rhizomes are large and branching. Leaves are large and green. Flowers are scented, borne in spikes, yellow with red stamens in H. gardnerianum and creamy yellow in H. flavescens. Fruits are fleshy and orange.
To help protect our environment:
Forest, forest and riparian margins, shrublands, fernland.
H. gardnerianum seed dispersed by birds. Vegetative spread from rhizome fragments. Human-mediated dispersal through dumping of garden waste.
Forms dense stands, suppressing native vegetation and preventing recruitment. Potential to change forest composition. May increase erosion and alter decomposition and nutrient cycling patterns.
Follow up treated areas 3 times per year. Encourage natural regeneration of native plants or replant treated areas where possible after 2-3 treatments to establish dense ground cover and minimise reinvasion.
CAUTION: When using any herbicide or pesticide please read the label thoroughly to ensure that all instructions and safety requirements are followed.