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Lythrum alatum (Winged loosestrife)

Other names: Winged lythrum, Salicaria alata, Angled purple loosestrife, Pythagorea alata

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Species
L. alatum is an upright, branching, rhizomatous, deciduous perennial or subshrub with four-angled, slightly winged stems bearing ovate to lance-shaped, dark green leaves and spikes of veined, purple to purple-pink flowers blooming from the leaf axils from early summer to early autumn.
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Season of interest

Flower

Spring Summer Autumn Winter
Flower

Foliage

Spring Summer Autumn Winter
Foliage
Height and spread

Height and spread

Size Max height Max spread To maturity
1 m 0.8 m 2-5 years
3 ft 2 ft 2-5 years

Where to grow

Soil type
  • Clay
  • Loamy
  • Sandy
Soil drainage
  • Boggy damp conditions
  • Moisture-retentive
Soil pH
  • Acid
  • Alkaline
  • Neutral
Sunlight
  • Full Sun
Aspect
  • East
  • West
  • South
Exposure
  • Exposed
  • Sheltered

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Additional plant details

Cultivation

Grow in humus-rich, moist to wet soil in full sun. Tolerates partial shade.

Suggested uses

Beds and borders, Cottage/Informal, Low Maintenance, Waterside, Bog garden, Prairie planting, Meadow, Bees (attract & feed bees)

UK hardiness

H7

USDA zones

Zone 3, Zone 4, Zone 5, Zone 6, Zone 7, Zone 8

Sunset zone

WUCOLS

North-Central Coastal = Unknown
Central Valley = Unknown
South Coastal = Unknown
South Inland = Unknown
High and Intermediate Desert = Unknown
Low Desert = Unknown

Foliage

Deciduous

Habit

Upright, Clump-forming, Branching

Native to

Eastern North America, Central North America, Central America, Cuba

Drought tolerant

No

Flood tolerant

Yes

Toxicity

Not toxic

Plant care

Pruning

Cut back in autumn. Cut back earlier if becoming unsightly.

Propagation methods

Division, Seed

Propagation

Surface sow seed in a cold frame in autumn. Alternatively, cold stratify in the refrigerator for 60 days prior to sowing in a cool greenhouse or propagator in spring.

Pests

Diseases

Water regularly through dry periods

Divide and replant in spring

Plant in fertile, moisture retentive soil

Cut back in autumn (optional)

Plant container grown plants in a sunny postion

Sow seeds in a cold frame in autumn

Sow seeds in a propagator in spring

Other plants

Plants in this Genus (0)

Lythrum

Companion plants (0)

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