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A picture of a Purple Loosestrife

Purple Loosestrife

Lythrum salicaria

Also known as

Black Blood, Long Purples, Purple Grass, Rainbow Weed, Red Sally, Rose Loosestrife, Rosy Strip, Sage Willow, Soldiers, Spiked Loosestrife, Willow Weed, Purple Lythrum, Purple willowherb

Lythrum salicaria - harilik kukesaba by Ivar Leidus (CC BY-SA 3.0)

Full Sun
Easy care
Frequent watering


RHS hardiness


Minimum temperature

Expected size








5 years to reach maturity


  • spring
  • summer
  • autumn
  • winter

This plant has a mild fragrance

More images of Purple Loosestrife

A close up of the pink flower of Lythrum salicaria
A photo of Purple Loosestrife

Purple Loosestrife Overview

Lythrum salicaria, commonly known as Purple Loosestrife, is a robust wildflower that produces dramatic and colourful flowering spikes. It is well-known for its rampant invasiveness and is often found in the wild in Northern Europe. Its preference for poorly drained and consistently moist soil makes it a great choice to grow alongside water or in boggy patches in full sun. The 2cm wide flower spikes are densely packed with bright purple flowers, extremely attractive to pollinating insects. Deadhead fading flowers before the seeds have developed and dividing plants every three years will help control these plants' spread.

Common problems with Purple Loosestrife

How to propagate Purple Loosestrife


Divide every three to five years by lifting - digging up clumps in spring or autumn, Replanting or potting up straight away.


Special features of Purple Loosestrife

Attractive flowers

Attracts useful insects

This species is part of the Royal Horticultural Society “Plants for Pollinators” initiative to showcase plants that support pollinator populations by providing ample nectar and/ or pollen. A great choice for encouraging pollinating insect wildlife into your garden!

Wet sites

Ground cover

Ideal to grow on banks alongside water.

Other uses of Purple Loosestrife

This plant suits being included in Cottage, Informal, Wildflower or Meadow planting schemes.

Pollinator Friendly Plants for Summer

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