California Loosestrife Plant Care
Lythrum californicum Torr. & A.Gray
Updated · Sources · How we source care data
Lythrum californicum is a species of flowering plant in the loosestrife family known by the common name California loosestrife. It is native to northern Mexico and the southwestern United States into the Midwest as far east as Oklahoma and Texas.
Every 7–10 days
Full sun to partial shade
60–80°F
40–70%
At a glance
How do you care for California Loosestrife?
Water California 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 California Loosestrife Native To?
What Is the California Loosestrife?
California Loosestrife (Lythrum californicum) belongs to the Lythraceae family within the Lythrum genus. California Loosestrife is native to northern Mexico and the southwestern United States into the Midwest as far east as Oklahoma and Texas.
California Loosestrife displays an upright, spreading perennial growth habit, reaching up to 3 ft tall with a spread of approximately 2 ft. California Loosestrife produces showy spikes of pink, purple, or magenta flowers.
Leaf size: approximately 4 inches.
How Often Should You Water a California Loosestrife?
Lythrum californicum 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 California Loosestrife Need?
California Loosestrife thrives in full sun to partial shade.
Light Requirement
Full sun to partial shade
What Temperature and Humidity Does the California Loosestrife Prefer?
Lythrum californicum grows best at temperatures of 60–80°F. California Loosestrife prefers humidity levels of 40–70%.
Temperature
60–80°F
Humidity
40–70%
What Soil Mix Works Best for a California Loosestrife?
Moist, fertile soil with good drainage. Good drainage is essential for California Loosestrife to prevent waterlogging, which leads to root rot and fungal issues.
How Often Should You Fertilize a California Loosestrife?
Feed California 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 California 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 California Loosestrife?
California Loosestrife can be propagated through seeds, division of rootball. Similar propagation techniques also apply to winged loosestrife plant care, which shares the same genus.
Is the California Loosestrife Toxic to Pets and Children?
Pet safety not verified
The ASPCA does not list California 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 California Loosestrife?
California 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 California Loosestrife Need?
California Loosestrife grows outdoors in USDA Zone 13a. It survives winters down to planting zone 13a. California Loosestrife is native to northern Mexico and the southwestern United States into the Midwest as far east as Oklahoma and Texas. In cooler regions, grow California Loosestrife as a houseplant or bring it indoors before the first frost.
Hardiness Zone
Zone 13a
Keep exploring plants
California 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.
California 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 californicum Torr. & A.Gray, family Lythraceae (first published in Fl. N. Amer. 1: 482 (1840)) — World Flora Online record, IPNI name record.
- Pet toxicity: Pet safety not verified: the ASPCA does not list California 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.
- Hardiness zone: USDA Zone 13a, calculated from the plant's minimum temperature.
- 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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