Description
• 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
Problems
• 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