Free-floating aquatic perennial. Distinctive swollen, bladder-like petioles attached to heavy, glossy, leathery leaves give buoyancy. Hyacinth-like flowers borne above foliage, pale lilac with purple markings, yellow spot.
Still or slow moving freshwater: ponds, streams, swamps. Frost-tender, mats tolerate moderate frosts.
Seeds & plant fragments dispersed by water, wind, machinery.Seeds viable for <20 years.
Aggressive plant chokes waterways displacing native flora. Twenty five plants can form 1ha mat over one growing season.
Report all sites to MAF.
Control under MAF direction.
1. Hand-pull small sites.
2. Spray (150ml glyphosate/10L, use glyphosate formulation approved for use over water).
Caution: when using any herbicide or pesticide PLEASE READ THE LABEL THOROUGHLY to ensure that all instructions and safety requirements are followed.