Description

Lythrum salicaria ‘Rosey Gem’ is a compact, richly coloured form of Purple Loosestrife, producing dense magenta‑rose flower spikes from mid‑summer into early autumn. This cultivar offers all the wildlife value of the native species but with a tidier, more controlled habit, making it ideal for smaller ponds, naturalistic schemes, and ornamental margins.

Supplied fresh from Artisan Aquatics, this is a vigorous, reliable, UK‑grown marginal that delivers height, colour, and pollinator activity throughout the warm months.

Key Features

• Compact cultivar of Purple Loosestrife
• Intense magenta‑rose flower spikes
• Highly attractive to bees, butterflies, and hoverflies
• Strong vertical accent for pond edges
• Hardy, long‑lived, and easy to grow
• Excellent for wildlife ponds and natural planting schemes

Planting & Positioning

• Planting depth: 0–10 cm above crown
• Position: Full sun for best flowering
• Ideal for: Pond margins, wet soils, bog gardens, naturalistic borders
• Growth habit: Upright clump‑forming perennial
• Flowering period: July–September

Care & Maintenance

• Cut back old stems in late autumn or early spring
• Divide every 2–3 years to maintain vigour
• Thrives in consistently moist soil
• Very hardy and tolerant of UK winters

Technical Data

• Botanical name: Lythrum salicaria ‘Rosey Gem’
• Growth rate: Medium–fast
• Supplied as: Bare‑root or potted (depending on stock)
• Wildlife value: Very high
• Native status: Cultivar of a UK native species

Companion Plant Suggestions

• Iris pseudacorus – bold yellow contrast
• Butomus umbellatus – soft pink umbels complement the spikes
• Mentha aquatica – aromatic, wildlife‑rich marginal
• Caltha palustris – early‑season colour before Lythrum blooms

FAQ 

Is Lythrum salicaria ‘Rosey Gem’ invasive?

No — this is a compact cultivar with a controlled habit, unlike the more robust wild form.

Does it attract wildlife?

Yes, it is exceptional for pollinators, especially bees and butterflies.

Can it grow in normal garden soil?

Yes — as long as the soil stays moist, it performs well in borders as well as pond edges.

How tall does it grow?

Typically 60–80 cm, shorter than the wild species.