Floating aquatic, bottom-rooted fern. Fronds resemble large 4-leaf clovers, float on water surface on stalks <1m.
Damp marginal areas <1m deep.
Doesn’t appear to produce spores; grows from stem & rhizome fragments.
Forms floating sub-surface mats with floating & emergent leaves. Out-competes native species, impedes drainage. Poisonous, can kill livestock.
Begin treatment at top of catchments & work downstream. Care needed with mechanical control as stem fragments regrow.
1.Use combination of mechanical control & herbicide to give effective control.
2.Spray (100ml glyphosate/10L (use glyphosate formulation approved for use over water), or 200ml diquat/10L).
Caution: when using any herbicide or pesticide PLEASE READ THE LABEL THOROUGHLY to ensure that all instructions and safety requirements are followed.