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•    Free floating plant with fibrous root system up to 1m long
•    Leaves dark green and rounded on bulb-like stems
•    Flowers bluish-purple, funnel-shaped, yellow mark in centre
•    Seeds in capsules at base of flower

Flowering Times

•    Mid-summer through to autumn

Control Measure

•    Mechanical
•    Herbicides
•    Biological – in certain situations


•    Chokes water systems and restricts recreation
•    Long seed viability – up to 15 years
•    Extremely fast growing – can double plant numbers in 5 days
•    Reduces wildlife habitat

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