Rock hemlock Plant Care
Conioselinum scopulorum J.M.Coult. & Rose
Updated · Sources · How we source care data
Conioselinum scopulorum, also commonly known as Rocky Mountain hemlockparsley or hemlock parsley, is a perennial herb found in parts of the Rocky Mountains from southern Montana to Arizona and New Mexico.
Every 4–7 days
Partial shade to full shade
50–75°F
40–70%
At a glance
How do you care for Rock hemlock?
Water Rock hemlock every 4–7 days, letting the top layer of soil dry out between waterings, and give it partial shade to full shade. It prefers temperatures of 50–75°F (10–24°C) and 40–70% humidity. Fertilize it every 6 months during the growing season.
Where Is the Rock hemlock Native To?
What Is the Rock hemlock?
Rock hemlock (Conioselinum scopulorum) belongs to the Apiaceae family within the Conioselinum genus. Rock hemlock is native to parts of the Rocky Mountains from southern Montana to Arizona and New Mexico.
Rock hemlock displays a clumping perennial herb growth habit, reaching up to 1.5 ft tall with a spread of approximately 1 ft. Rock hemlock produces small clusters of white or pink flowers in umbels.
Leaf size: approximately 4 inches.
How Often Should You Water a Rock hemlock?
Conioselinum scopulorum requires watering every 4–7 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 4–7 days
Let soil partially dry between waterings
What Light Does the Rock hemlock Need?
Rock hemlock thrives in partial shade to full shade. The optimal light range is 100–500 lux. Avoid placing Rock hemlock in direct, harsh sunlight for extended periods, as this can scorch the foliage.
Light Requirement
Partial shade to full shade
100–500 lux
What Temperature and Humidity Does the Rock hemlock Prefer?
Conioselinum scopulorum grows best at temperatures of 50–75°F. Rock hemlock prefers humidity levels of 40–70%.
Temperature
50–75°F
Humidity
40–70%
What Soil Mix Works Best for a Rock hemlock?
Rich, well-draining soil with high organic content. Good drainage is essential for Rock hemlock to prevent waterlogging, which leads to root rot and fungal issues.
How Often Should You Fertilize a Rock hemlock?
Feed Rock hemlock 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 Rock hemlock?
Repot every 1-2 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 Rock hemlock?
Rock hemlock can be propagated through seeds, division of roots.
Is the Rock hemlock Toxic to Pets and Children?
Pet safety not verified
The ASPCA does not list Rock hemlock, 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 Rock hemlock?
Rock hemlock is susceptible to aphids, caterpillars, spider mites. 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 Rock hemlock Need?
Rock hemlock grows outdoors in USDA Zone 12a. It survives winters down to planting zone 12a. Rock hemlock is native to parts of the Rocky Mountains from southern Montana to Arizona and New Mexico. In cooler regions, grow Rock hemlock as a houseplant or bring it indoors before the first frost.
Hardiness Zone
Zone 12a
Keep exploring plants
Rock hemlock 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 Conioselinum genus (family Apiaceae) — search all Conioselinum species in the plant lookup.
Rock hemlock copes with lower light than most plants — browse the full list of low-light plants.
Related Plant Care Guides
Closely related plants with similar care requirements:
Sources
- Scientific name & taxonomy: Conioselinum scopulorum J.M.Coult. & Rose, family Apiaceae (first published in Contr. U.S. Natl. Herb. 7: 151 (1900)) — World Flora Online record, IPNI name record.
- Pet toxicity: Pet safety not verified: the ASPCA does not list Rock hemlock, 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 12a, 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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