Purple Loosestrife: Beautiful but Highly Invasive Wetland Threat

Lythrum salicaria (Purple Loosestrife)

The showy purple spikes are attractive in gardens and roadsides, but this plant's rampant spread has severely reduced the ecological value of marshes by displacing native wetland vegetation like cattails that wildlife depends on. One mature plant can produce over 2 million seeds annually, easily transported by wind or water. Even cultivars reported as sterile can produce fertile seed if grown near other loosestrifes.

Noteworthy Characteristics

Showy purple flower spikes. Highly invasive in all regions.

Growing Conditions & Care

Grows in any moist soil in full sun.

Propagation

Self-sows with abandon.

Common Problems

Slugs, snails, Japanese beetles.

Quick Reference

• Height: 3–6 ft.
• Spread: 1–3 ft.
• Growth Habit: Clumps
• Growth Pace: Invasive/Aggressive
• Light: Full Sun
• Moisture: Medium to Wet
• Maintenance: Moderate
• Bloom Time: Summer, Fall
• Flower Color: Pink, Purple
• Uses: Beds and Borders (not recommended)
• Type: Perennials