Osha Plant Care
Ligusticum porteri J.M.Coult. & Rose
Updated · Sources · How we source care data
Ligusticum porteri, also known as osha or Porter lovage, is a perennial herb found in parts of the Rocky Mountains and northern New Mexico, in the southwestern United States.
Every 7–10 days
Full sun to partial shade
60–75°F
40–60%
At a glance
How do you care for Osha?
Water Osha 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 60–75°F (16–24°C) and 40–60% humidity. Fertilize it every 6 months during the growing season.
Where Is the Osha Native To?
What Is the Osha?
Osha (Ligusticum porteri) belongs to the Apiaceae family within the Ligusticum genus. Osha is native to parts of the Rocky Mountains and northern New Mexico, in the southwestern United States. Osha is also known as Porter's Lovage, Wild Lovage, Colorado Cough Root.
Osha displays an upright, clumping perennial growth habit, reaching up to 3 ft tall with a spread of approximately 2 ft. Osha produces small clusters of white or pink umbels.
Leaf size: approximately 6 inches.
How Often Should You Water a Osha?
Ligusticum porteri 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 Osha Need?
Osha thrives in full sun to partial shade.
Light Requirement
Full sun to partial shade
What Temperature and Humidity Does the Osha Prefer?
Ligusticum porteri grows best at temperatures of 60–75°F. Osha prefers humidity levels of 40–60%.
Temperature
60–75°F
Humidity
40–60%
What Soil Mix Works Best for a Osha?
Well-draining loamy soil with added organic matter for moisture retention. Good drainage is essential for Osha to prevent waterlogging, which leads to root rot and fungal issues.
How Often Should You Fertilize a Osha?
Feed Osha 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 Osha?
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 Osha?
Osha can be propagated through seeds, division of root ball. Similar propagation techniques also apply to canadian lovage plant care, which shares the same genus.
Is the Osha Toxic to Pets and Children?
Pet safety not verified
The ASPCA does not list Osha, 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 Osha?
Osha is susceptible to aphids, carrot rust fly, celery leaf tier. 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 Osha Need?
Osha grows outdoors in USDA Zone 13a. It survives winters down to planting zone 13a. Osha is native to parts of the Rocky Mountains and northern New Mexico, in the southwestern United States. In cooler regions, grow Osha as a houseplant or bring it indoors before the first frost.
Hardiness Zone
Zone 13a
Keep exploring plants
Osha 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 Ligusticum genus — compare its care with other Ligusticum species on PlantoScan.
Ligusticum is part of the Apiaceae plant family — browse all Apiaceae genera and species.
Osha thrives in bright light and direct sun — see other bright-light plants.
Related Plant Care Guides
Closely related plants with similar care requirements:
Sources
- Scientific name & taxonomy: Ligusticum porteri J.M.Coult. & Rose, family Apiaceae (first published in Rev. N. Amer. Umbell. : 86 (1888)) — World Flora Online record, IPNI name record.
- Pet toxicity: Pet safety not verified: the ASPCA does not list Osha, 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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