North America Native Plant

Rocky Mountain Hemlockparsley

Botanical name: Conioselinum scopulorum

USDA symbol: COSC2

Life cycle: perennial

Habit: forb

Native status: Native to the lower 48 states  

Rocky Mountain Hemlockparsley: A Hidden Gem for Western Native Gardens If you’re looking to add some delicate beauty and ecological value to your western garden, let me introduce you to a charming native that often flies under the radar: Rocky Mountain hemlockparsley (Conioselinum scopulorum). This understated perennial might not have ...

Rocky Mountain Hemlockparsley: A Hidden Gem for Western Native Gardens

If you’re looking to add some delicate beauty and ecological value to your western garden, let me introduce you to a charming native that often flies under the radar: Rocky Mountain hemlockparsley (Conioselinum scopulorum). This understated perennial might not have the flashiest name, but it’s got personality and purpose in spades!

What Is Rocky Mountain Hemlockparsley?

Rocky Mountain hemlockparsley is a native perennial forb that belongs to the carrot family. Don’t worry – despite its hemlock moniker, this plant is perfectly safe for your garden (just don’t confuse it with poison hemlock, which is an entirely different troublemaker). This gentle native grows as a non-woody plant, meaning it dies back to the ground each winter and returns fresh each spring.

Where Does It Call Home?

This mountain lover is truly a western native, naturally occurring across six western states: Arizona, Colorado, Montana, New Mexico, Utah, and Wyoming. You’ll find it thriving in the higher elevations and mountainous regions of these areas, where it has adapted to the unique growing conditions of the American West.

Why Your Garden Will Love This Native

There are several compelling reasons to consider adding Rocky Mountain hemlockparsley to your landscape:

  • True native credentials: As a plant native to the lower 48 states, it supports local ecosystems and wildlife
  • Pollinator magnet: Its delicate umbel flowers (think tiny white flower clusters) are fantastic for attracting native bees and other beneficial insects
  • Low-maintenance once established: Native plants are naturally adapted to local conditions
  • Wetland flexibility: With its facultative wetland status, it can handle both moist and occasionally drier conditions

Perfect Garden Roles

Rocky Mountain hemlockparsley shines in several garden settings:

  • Native plant gardens and naturalized landscapes
  • Rain gardens and bioswales
  • Wildlife gardens focused on supporting pollinators
  • Mountain-style or high-altitude themed gardens
  • Areas that stay consistently moist but aren’t soggy

Growing Conditions and Care

This mountain native has some specific preferences, but they’re not too demanding once you understand what it wants:

  • Moisture: Prefers consistently moist soil – think facultative wetland conditions
  • Soil: Well-draining but moisture-retentive soil enriched with organic matter
  • Sun exposure: Partial shade to full sun, with some protection during hot afternoons in lower elevations
  • Hardiness: Suitable for USDA zones 3-7, perfect for mountain and northern climates
  • Elevation: Thrives at higher elevations where it naturally occurs

Planting and Care Tips

Getting Rocky Mountain hemlockparsley established in your garden requires a bit of attention to detail:

  • Plant in spring after the last frost when soil is workable
  • Choose a location that stays consistently moist but doesn’t flood
  • Amend heavy clay soils with compost to improve drainage while retaining moisture
  • Mulch around plants to help retain soil moisture
  • Water regularly during the first growing season to establish deep roots
  • Once established, it should be relatively drought-tolerant but performs best with consistent moisture

Is This Plant Right for You?

Rocky Mountain hemlockparsley is an excellent choice if you:

  • Garden in the western United States, particularly in its native range
  • Want to support native pollinators and wildlife
  • Have a consistently moist area that needs an attractive native plant
  • Enjoy delicate, naturalistic garden aesthetics
  • Garden at higher elevations where this plant naturally thrives

However, you might want to consider other options if you’re looking for a showy centerpiece plant or if you garden in very dry, desert-like conditions where maintaining consistent moisture would be challenging.

The Bottom Line

Rocky Mountain hemlockparsley may not be the flashiest native plant on the block, but it’s a solid, reliable choice for western gardeners who want to support local ecosystems while adding gentle beauty to their landscapes. Its pollinator benefits, native status, and adaptability to both wet and moderately dry conditions make it a valuable addition to any native plant collection. Just remember to give it the consistent moisture it craves, and it’ll reward you with delicate flowers and the satisfaction of knowing you’re supporting your local ecosystem!

Wetland Status

The rule of seasoned gardeners and landscapers is to choose the "right plant for the right place" matching plants to their ideal growing conditions, so they'll thrive with less work and fewer inputs. But the simplicity of this catchphrase conceals how tricky plant selection is. While tags list watering requirements, there's more to the story.

Knowing a plant's wetland status can simplify the process by revealing the interaction between plants, water, and soil. Surprisingly, many popular landscape plants are wetland species! And what may be a wetland plant in one area, in another it might thrive in drier conditions. Also, it helps you make smarter gardening choices and grow healthy plants with less care and feeding, saving you time, frustration, and money while producing an attractive garden with greater ecological benefits.

Regions
Status
Moisture Conditions

Arid West

FACW

Facultative Wetland - Plants with this status usually occurs in wetlands but may occur in non-wetlands

Great Plains

FACW

Facultative Wetland - Plants with this status usually occurs in wetlands but may occur in non-wetlands

Western Mountains, Valleys, and Coast

FACW

Facultative Wetland - Plants with this status usually occurs in wetlands but may occur in non-wetlands

Rocky Mountain Hemlockparsley

Classification

Group

Dicot

Kingdom

Plantae - Plants

Subkingdom

Tracheobionta - Vascular plants

Superdivision

Spermatophyta - Seed plants

Division

Magnoliophyta - Flowering plants

Subdivision
Class

Magnoliopsida - Dicotyledons

Subclass

Rosidae

Order

Apiales

Family

Apiaceae Lindl. - Carrot family

Genus

Conioselinum Hoffm. - hemlockparsley

Species

Conioselinum scopulorum (A. Gray) J.M. Coult. & Rose - Rocky Mountain hemlockparsley

Plant data source: USDA, NRCS 2025. The PLANTS Database. https://plants.usda.gov,. 2/25/2025. National Plant Data Team, Greensboro, NC USA