Purple Loosestrife (Lythrum salicaria) is a tall, striking perennial wildflower native to the UK. It produces vibrant spikes of magenta-purple flowers from mid to late summer and is commonly found in wetland margins, riverbanks, marshes, and damp grasslands. Its long flowering period and nectar-rich blooms make it a favourite among pollinators, especially bees and butterflies.

Ideal for wet, nutrient-rich soils and full sun to partial shade, Purple Loosestrife thrives in naturalistic planting schemes designed to support biodiversity. Its upright habit and eye-catching colour also make it a valuable feature in rain gardens, pond edges, and rewilding projects.

Features & Benefits
Striking magenta-purple flower spikes
Attracts bees, butterflies, and other pollinators
Native UK species ideal for wetland and riparian planting
Long flowering period provides extended ecological value
Adds structure and colour to pond margins and wet meadows

Latin Name:
Lythrum salicaria

Flowering Time:
June – August

Flowering Height:
80 – 120 cm

Life Cycle:
Perennial

Wildflower Seed Approximate Sowing Rate:
0.25kg per acre (0.62kg per hectare)

Sowing Times:
Autumn (August – October) or Spring (March – May)

How to Sow & Preparation
Select a site with moist to wet soils, ideally near ponds, streams, or wet meadows.
Clear any existing vegetation and cultivate a fine tilth on the surface.
Broadcast the seed evenly and press lightly into the soil—do not cover deeply.
Keep the area moist during establishment.
Ideal for sowing alongside other wetland species in marginal areas.
Allow to naturalise and self-seed in suitable conditions.

About John Chambers Wildflower Seeds
John Chambers Wildflower Seeds has been a trusted supplier of native UK wildflower seeds for over 35 years. Known for its high-quality, locally sourced seed and outstanding customer service, John Chambers provides ecological solutions for landscape contractors, local authorities, and conservationists focused on creating sustainable, biodiverse landscapes.

Latin Name | Lythrum salicaria

Flowering Time | June – August

Flowering Height | 80 – 120 cm

Life Cycle | Perennial

Sowing Rate | 0.25 kg per acre (0.62 kg per hectare)

Sowing Period | Spring (March – May) or Autumn (August – October)

Preferred Conditions | Wet or damp soils, full sun to light shade

Pollinator Friendly | Yes

Minimum Order Quantity | 10g

Ideal For | Pond margins, wetlands, riversides, rain gardens