North America Native Plant

Rocky Mountain Phlox

Botanical name: Phlox multiflora patula

USDA symbol: PHMUP

Life cycle: perennial

Habit: forb

Native status: Native to the lower 48 states  

Synonyms: Phlox patula A. Nelson (PHPA16)   

Rocky Mountain Phlox: A Hidden Gem for Western Gardens If you’re gardening in the Rocky Mountain region and looking for a native perennial that’s both beautiful and low-maintenance, Rocky Mountain phlox (Phlox multiflora patula) might just be the perfect addition to your landscape. This charming native wildflower brings delicate beauty ...

Rocky Mountain Phlox: A Hidden Gem for Western Gardens

If you’re gardening in the Rocky Mountain region and looking for a native perennial that’s both beautiful and low-maintenance, Rocky Mountain phlox (Phlox multiflora patula) might just be the perfect addition to your landscape. This charming native wildflower brings delicate beauty to gardens while supporting local ecosystems.

What Makes Rocky Mountain Phlox Special?

Rocky Mountain phlox is a native perennial forb – essentially a non-woody flowering plant that comes back year after year. As a true native of the American West, this plant has evolved to thrive in the challenging conditions of the Rocky Mountain region, making it an excellent choice for gardeners who want to work with nature rather than against it.

You might also see this plant referred to by its synonym, Phlox patula, in some older gardening references or botanical texts.

Where Does It Grow Naturally?

This lovely native calls Colorado, Montana, and Wyoming home, thriving in the unique conditions of the Rocky Mountain ecosystem. Its natural range tells us a lot about what this plant needs to succeed in your garden.

Why Consider Rocky Mountain Phlox for Your Garden?

There are several compelling reasons to give this native beauty a spot in your landscape:

  • Native authenticity: As a true regional native, it supports local wildlife and fits naturally into Western landscapes
  • Low maintenance: Once established, native plants typically require less water, fertilizer, and pest control than non-native alternatives
  • Pollinator support: Like other phlox species, it likely attracts butterflies and beneficial insects
  • Adaptability: Evolved to handle the temperature swings and challenging conditions common in the Rocky Mountains

Perfect Garden Settings

Rocky Mountain phlox works beautifully in several garden styles:

  • Native plant gardens: Pairs wonderfully with other regional natives
  • Rock gardens: Its compact growth habit makes it ideal for rocky, well-drained areas
  • Wildflower meadows: Adds natural charm to prairie-style plantings
  • Low-water landscapes: Perfect for xeriscaping and drought-tolerant gardens

Growing Rocky Mountain Phlox Successfully

While specific growing information for this particular variety is limited, its native range gives us valuable clues about its preferences:

Climate and Hardiness

Given its natural distribution in Colorado, Montana, and Wyoming, Rocky Mountain phlox likely thrives in USDA hardiness zones 3-7, handling cold winters and variable mountain weather with ease.

Site Selection and Soil

Based on its Rocky Mountain heritage, this plant probably prefers:

  • Well-drained soils (essential for preventing root rot)
  • Full sun to partial shade
  • Sites that aren’t consistently wet or boggy

Planting and Care Tips

To give your Rocky Mountain phlox the best start:

  • Plant in spring after the last frost date
  • Choose a location with good drainage
  • Water regularly the first year to help establishment
  • Once established, it should be quite drought-tolerant
  • Avoid over-fertilizing, which can make native plants leggy

A Note on Availability

Rocky Mountain phlox can be somewhat challenging to find in typical garden centers, as it’s a regional native with limited commercial production. Your best bet is to check with:

  • Native plant nurseries in the Rocky Mountain region
  • Native plant society sales and exchanges
  • Specialty wildflower seed companies

The Bottom Line

If you garden in Colorado, Montana, or Wyoming and want to create a landscape that truly belongs in your region, Rocky Mountain phlox offers an authentic native option that’s both beautiful and ecologically valuable. While it might take a bit of hunting to find, this charming perennial rewards patient gardeners with its natural beauty and easy-going nature once established.

Remember, native plants like Rocky Mountain phlox aren’t just pretty faces – they’re the foundation of healthy local ecosystems, supporting the wildlife that makes our regions special. By choosing natives, you’re not just creating a beautiful garden; you’re helping preserve the natural heritage of the American West.

Rocky Mountain Phlox

Classification

Group

Dicot

Kingdom

Plantae - Plants

Subkingdom

Tracheobionta - Vascular plants

Superdivision

Spermatophyta - Seed plants

Division

Magnoliophyta - Flowering plants

Subdivision
Class

Magnoliopsida - Dicotyledons

Subclass

Asteridae

Order

Solanales

Family

Polemoniaceae Juss. - Phlox family

Genus

Phlox L. - phlox

Species

Phlox multiflora A. Nelson - flowery phlox

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