Common name/s ?

Purple loosestrife 'Blush', loosestrife 'Blush' and spiked loosestrife 'Blush'.

Skill rating



Europe and Asia.

Type of plant ?

Herbaceous, deciduous perennial.

Hardiness zone ?

RHS zone


EGF zone


USDA zone


Eventual size

1.5m height by 50cm spread.

Growth rate ?

Moderate, will reach full size in 2 to 5 years.

Shape it grows into

Forms clumps of foliage from which flowers grow on tall stems.

Season/s of interest

Flowers throughout summer and autumn.

Where to grow it

Happy in full sun or part shade.
Prefers moist to wet soil.

Happy in any soil type so long as it is sufficiently wet.

Lythrum salicaria 'Blush'


Long heads with clusters of pretty pink flowers appearing from summer through to autumn. The stems are square (when viewed in cross section).

What to use it for

Good for waterside plantings and bog gardens as it likes moist to wet soil. Can also be used in borders and beds or in containers (if kept well watered). Happy in coastal situations.

How to look after it

Deadheading is important as this plant can self-seed and become quite invasive.

How to prune it

Deadhead throughout the flowering season and cut down the spent stems to ground level in late autumn.

How to propagate it

Divide the plant or take basal stem cuttings in spring. Alternatively, it can be propagated by seed in spring (the sown seeds should be kept warm, around 15°C).

Common problems

May be targeted by slugs and snails, but is generally disease free.

Other useful information ?

Has been given the Award of Garden Merit by the RHS.

The species Lythrum salicaria is considered a major weed in many areas, particularly in northern USA. Each plant can produce up to 2.7 million seeds each year and, therefore, may quickly become invasive and crowd out other plants.

The name Lythrum derives from the Greek ‘lythron’, meaning blood. This may refer to the plant’s medicinal use in controlling bleeding. It is also used as a diuretic and for soothing irritated tissues.