Photo: Jeremy GilmoreCC BY 4.0via iNaturalistresized / cropped
Hyssop Loosestrife Plant Care
Lythrum hyssopifolia L.
Updated · Sources · How we source care data
This plant's narrow, lance-shaped leaves are its most distinctive visual feature. Originating from Europe and western Asia, it is prized by plant collectors for its ability to attract pollinators like bees and butterflies with its vibrant purple flowers.
Every 7–10 days
Full sun to partial shade
60–80°F
40–70%
At a glance
How do you care for Hyssop Loosestrife?
Water Hyssop 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 Hyssop Loosestrife Native To?
- Albania
- Austria
- Belarus
- Belgium
- Bosnia and Herzegovina
- Bulgaria
- Croatia
- Cyprus
- Czechia
- Denmark
- Estonia
- Finland
- France
- Germany
- Greece
- Hungary
- Iceland
- Ireland
- Italy
- Latvia
- Lithuania
- Luxembourg
- Malta
- Moldova
- Montenegro
- North Macedonia
- Norway
- Poland
- Portugal
- Romania
- Russia
- Serbia
- Slovakia
- Slovenia
- Spain
- Sweden
- Switzerland
- The Netherlands
- Ukraine
- United Kingdom
What Is the Hyssop Loosestrife?
Hyssop Loosestrife (Lythrum hyssopifolia) belongs to the Lythraceae family within the Lythrum genus. Hyssop Loosestrife is native to Europe. Hyssop Loosestrife is also known as Small Loosestrife, Whorled Loosestrife.
Hyssop Loosestrife displays an upright, spreading perennial growth habit, reaching up to 3 ft tall with a spread of approximately 2 ft. Hyssop Loosestrife produces showy spikes of pink, purple, or magenta flowers.
Leaf size: approximately 4 inches.
How Often Should You Water a Hyssop Loosestrife?
Lythrum hyssopifolia 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 Hyssop Loosestrife Need?
Hyssop Loosestrife thrives in full sun to partial shade.
Light Requirement
Full sun to partial shade
What Temperature and Humidity Does the Hyssop Loosestrife Prefer?
Lythrum hyssopifolia grows best at temperatures of 60–80°F. Hyssop Loosestrife prefers humidity levels of 40–70%.
Temperature
60–80°F
Humidity
40–70%
What Soil Mix Works Best for a Hyssop Loosestrife?
Moist, fertile soil with good drainage. Good drainage is essential for Hyssop Loosestrife to prevent waterlogging, which leads to root rot and fungal issues.
How Often Should You Fertilize a Hyssop Loosestrife?
Feed Hyssop 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 Hyssop 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 Hyssop Loosestrife?
Hyssop 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 Hyssop Loosestrife Toxic to Pets and Children?
Pet safety not verified
The ASPCA does not list Hyssop 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 Hyssop Loosestrife?
Hyssop 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 Hyssop Loosestrife Need?
Hyssop Loosestrife grows outdoors in USDA Zone 13a. It survives winters down to planting zone 13a. Hyssop Loosestrife is native to Europe. In cooler regions, grow Hyssop Loosestrife as a houseplant or bring it indoors before the first frost.
Hardiness Zone
Zone 13a
Keep exploring plants
Hyssop 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.
Hyssop 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 hyssopifolia L., family Lythraceae (first published in Sp. Pl. : 447 (1753)) — World Flora Online record, IPNI name record.
- Pet toxicity: Pet safety not verified: the ASPCA does not list Hyssop 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: Jeremy Gilmore, CC BY 4.0, iNaturalist — original.
- 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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