Photo: no rights reservedCC0 1.0via iNaturalist
Winged Loosestrife Plant Care
Lythrum alatum Pursh
Updated · Sources · How we source care data
With its strikingly winged stems, this plant is instantly recognizable as a member of the Lythrum alatum species. Native to North America, its unique appearance and vibrant purple flowers make it a sought-after addition to any plant collector's garden.
Every 7–10 days
Full sun to partial shade
60–80°F
40–70%
At a glance
How do you care for Winged Loosestrife?
Water Winged Loosestrife every 7–10 days, letting the top layer of soil dry out between waterings, and give it full sun to partial shade. It prefers temperatures of 60–80°F (16–27°C) and 40–70% humidity. Fertilize it every 6 months during the growing season.
Where Is the Winged Loosestrife Native To?
What Is the Winged Loosestrife?
Winged Loosestrife (Lythrum alatum) belongs to the Lythraceae family within the Lythrum genus. Winged Loosestrife is native to wetland areas in central and eastern United States and Ontario. Winged Loosestrife is also known as Purple Loosestrife.
Winged Loosestrife displays an upright, spreading perennial growth habit, reaching up to 3 ft tall with a spread of approximately 2 ft. Winged Loosestrife produces showy spikes of pink, purple, or magenta flowers.
Leaf size: approximately 4 inches.
How Often Should You Water a Winged Loosestrife?
Lythrum alatum requires watering every 7–10 days. Allow the top layer of soil to dry between waterings to prevent root rot. Reduce watering frequency during winter when growth slows.
Watering Frequency
Every 7–10 days
Let soil partially dry between waterings
What Light Does the Winged Loosestrife Need?
Winged Loosestrife thrives in full sun to partial shade.
Light Requirement
Full sun to partial shade
What Temperature and Humidity Does the Winged Loosestrife Prefer?
Lythrum alatum grows best at temperatures of 60–80°F. Winged Loosestrife prefers humidity levels of 40–70%.
Temperature
60–80°F
Humidity
40–70%
What Soil Mix Works Best for a Winged Loosestrife?
Moist, fertile soil with good drainage. Good drainage is essential for Winged Loosestrife to prevent waterlogging, which leads to root rot and fungal issues.
How Often Should You Fertilize a Winged Loosestrife?
Feed Winged Loosestrife every 6 months during the growing season (spring and summer) with a balanced fertilizer diluted to the strength on the label.
Pause feeding in autumn and winter, when growth slows, and never fertilize dry soil — water first.
Fertilizing
Every 6 months
During the growing season
The PlantoScan app can remind you when to water and when to fertilize each plant.
How Do You Repot a Winged Loosestrife?
Divide and repot every 2-3 years in early spring. Choose a pot one size larger than the current container, and ensure it has drainage holes to allow excess water to escape.
How Do You Propagate a Winged Loosestrife?
Winged Loosestrife can be propagated through seeds, division of rootball. Similar propagation techniques also apply to hyssop loosestrife plant care, which shares the same genus.
Is the Winged Loosestrife Toxic to Pets and Children?
Pet safety not verified
The ASPCA does not list Winged Loosestrife, so we can't confirm whether it is safe for cats and dogs. Keep pets from chewing it as a precaution.
This is a general caution, not veterinary or medical advice. If your pet ate a plant, contact your vet or animal poison control.
See all plants toxic to cats and plants toxic to dogs.
What Pests and Diseases Affect the Winged Loosestrife?
Winged Loosestrife is susceptible to aphids, japanese beetles. Inspect the foliage regularly, especially along leaf undersides and stems. Treat infestations promptly with insecticidal soap or neem oil to prevent spread.
Yellow leaves, brown tips or drooping? See common plant problems and how to fix them.
What USDA Hardiness Zone Does the Winged Loosestrife Need?
Winged Loosestrife grows outdoors in USDA Zone 3a – 9b. It survives winters down to planting zone 3a. Winged Loosestrife is native to wetland areas in central and eastern United States and Ontario.
Hardiness Zone
Zone 3a – 9b
Keep exploring plants
Winged Loosestrife is one of many species covered in the complete plant care and identification guide, which groups plants by genus, attribute, and popularity.
It belongs to the Lythrum genus — compare its care with other Lythrum species on PlantoScan.
Lythrum is part of the Lythraceae plant family — browse all Lythraceae genera and species.
Winged Loosestrife thrives in bright light and direct sun — see other bright-light plants.
More Lythrum Species
Other Lythrum species in PlantoScan's care catalogue share similar watering, light, and soil preferences:
Sources
- Scientific name & taxonomy: Lythrum alatum Pursh, family Lythraceae (first published in Fl. Amer. Sept. 1: 334 (1813)) — World Flora Online record, IPNI name record.
- Pet toxicity: Pet safety not verified: the ASPCA does not list Winged Loosestrife, so we can't confirm whether it is safe for cats and dogs. Checked against the ASPCA plant list; any other toxicity note on this page comes from PlantoScan's plant database.
- Photo: Public domain, CC0 1.0, iNaturalist — original.
- Hardiness zone: USDA Zone 3a – 9b, estimated from the plant's typical growing conditions.
- Care values(watering, light, temperature, humidity, soil, fertilizing): PlantoScan's plant database, filtered by automatic plausibility checks — values that fail them are hidden. How we source and check plant data.
Spotted a mistake? Email info@upvision.media with the page link — we check and correct reported errors.
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