North America Native Plant

Cedar Mountain Fameflower

Botanical name: Phemeranthus thompsonii

USDA symbol: PHTH6

Life cycle: perennial

Habit: forb

Native status: Native to the lower 48 states  

Synonyms: Talinum thompsonii N.D. Atwood & S.L. Welsh (TATH)   

Cedar Mountain Fameflower: A Rare Utah Gem for the Dedicated Native Plant Gardener Meet one of Utah’s most exclusive wildflowers – the Cedar Mountain fameflower (Phemeranthus thompsonii). This little-known native beauty is so rare that spotting one in the wild is like finding a botanical treasure. But before we dive ...

Rare plant alert!

Region: Conservation status by state

Status: S1: Status is uncertain but is somewhere between the following rankings: Critically Imperiled: Extremely rare due to factor(s) making it especially vulnerable to extinction. Typically 5 or fewer occurrences or very few remaining individuals (<1,000) ⚘

Cedar Mountain Fameflower: A Rare Utah Gem for the Dedicated Native Plant Gardener

Meet one of Utah’s most exclusive wildflowers – the Cedar Mountain fameflower (Phemeranthus thompsonii). This little-known native beauty is so rare that spotting one in the wild is like finding a botanical treasure. But before we dive into growing this special plant, there’s something important you need to know about its conservation status.

A Plant on the Brink

Here’s the thing about Cedar Mountain fameflower – it’s what botanists call critically imperiled. With a Global Conservation Status of S1, this means there are typically only five or fewer known locations where it grows, with very few remaining individuals in the wild (fewer than 1,000 plants total). That’s pretty sobering when you think about it.

If you’re considering adding this rare beauty to your garden, please make sure you’re getting it from a responsible source that propagates plants rather than collecting from wild populations. Every wild plant matters when there are so few left.

Where in the World?

Cedar Mountain fameflower is what we call an endemic species – it’s found naturally in only one place on Earth. This perennial forb calls Utah home, specifically the Cedar Mountain area in Iron County. Talk about being a local specialty!

What Makes It Special?

Despite its rarity, Cedar Mountain fameflower has some charming qualities that make it worth seeking out:

  • Delicate pink to magenta flowers that open in the late afternoon – perfect for evening garden enjoyment
  • Succulent-like foliage that’s perfectly adapted to dry conditions
  • Small stature that makes it ideal for rock gardens and specialized plantings
  • Attracts small native bees and other pollinators during its blooming period

As a forb (that’s botanist-speak for a non-woody herbaceous plant), it dies back to ground level each winter but returns faithfully each spring – assuming you can keep it happy.

Is This Plant Right for Your Garden?

Cedar Mountain fameflower isn’t for every gardener or every garden. Here’s who should consider it:

  • Native plant enthusiasts who want to grow truly rare species
  • Rock garden specialists looking for unique additions
  • Xeriscaping aficionados who appreciate drought-adapted plants
  • Conservation-minded gardeners who want to help preserve rare species

This isn’t a plant for beginners or casual gardeners. It requires specific conditions and careful attention to thrive.

Growing Cedar Mountain Fameflower Successfully

Think of this plant’s native habitat – rocky mountain slopes in Utah where drainage is perfect and rainfall is minimal. Here’s how to recreate those conditions:

Location and Soil

  • Choose a spot with full sun exposure
  • Ensure absolutely perfect drainage – soggy soil is this plant’s enemy
  • Use rocky, gravelly soil that mimics its mountain home
  • Consider raised beds or rock gardens for better drainage control

Watering and Care

  • Water sparingly – this plant is adapted to dry conditions
  • Avoid overhead watering that might encourage rot
  • Provide winter protection from wet conditions rather than cold
  • Allow the plant to go dormant naturally in winter

Climate Considerations

Based on its Utah mountain habitat, Cedar Mountain fameflower likely thrives in USDA hardiness zones 4-7. It can handle cold temperatures but struggles with humidity and excessive moisture.

A Plant Worth Preserving

Growing Cedar Mountain fameflower isn’t just about adding an unusual plant to your collection – it’s about participating in conservation. By growing this rare species in cultivation, you’re helping ensure its survival for future generations. Plus, you’ll have the satisfaction of successfully growing one of North America’s rarest wildflowers.

Just remember: source responsibly, provide excellent drainage, and enjoy the quiet satisfaction of nurturing something truly special. Your evening garden visits will be rewarded with those lovely pink blooms that open just as the day winds down.

Cedar Mountain Fameflower

Classification

Group

Dicot

Kingdom

Plantae - Plants

Subkingdom

Tracheobionta - Vascular plants

Superdivision

Spermatophyta - Seed plants

Division

Magnoliophyta - Flowering plants

Subdivision
Class

Magnoliopsida - Dicotyledons

Subclass

Caryophyllidae

Order

Caryophyllales

Family

Portulacaceae Dumort. - Purslane family

Genus

Phemeranthus Raf. - flameflower

Species

Phemeranthus thompsonii (N.D. Atwood & S.L. Welsh) Kiger - Cedar Mountain fameflower

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