North America Native Plant

Lonely Phlox

Botanical name: Phlox solivagus

USDA symbol: PHSO5

Life cycle: perennial

Habit: forb

Native status: Native to the lower 48 states  

Lonely Phlox: Washington’s Mysterious Native Wildflower Meet the lonely phlox (Phlox solivagus), a perennial wildflower that lives up to its common name in more ways than one. This native Washington species is so elusive that even botanists and native plant enthusiasts rarely encounter it in the wild. If you’re drawn ...

Lonely Phlox: Washington’s Mysterious Native Wildflower

Meet the lonely phlox (Phlox solivagus), a perennial wildflower that lives up to its common name in more ways than one. This native Washington species is so elusive that even botanists and native plant enthusiasts rarely encounter it in the wild. If you’re drawn to rare and unusual native plants, the lonely phlox might capture your imagination – though actually growing it presents some unique challenges.

What Makes Lonely Phlox Special?

Phlox solivagus belongs to the diverse phlox family, but unlike its more common cousins that grace many native gardens, this species keeps a much lower profile. As a perennial forb (a non-woody flowering plant), it lacks the substantial woody stems of shrubs and trees, instead producing soft, herbaceous growth that dies back seasonally while the root system persists year after year.

The lonely phlox is truly a Washington native, found nowhere else in the lower 48 states. This limited geographic distribution makes it a special piece of the Pacific Northwest’s botanical puzzle.

The Challenge of Growing Rare Natives

Here’s where things get tricky for the average gardener: lonely phlox is so uncommon that detailed growing information simply isn’t available. We don’t have reliable data about its preferred growing conditions, hardiness zones, or care requirements. This mystery surrounding the species means that even experienced native plant gardeners would struggle to cultivate it successfully.

Why Consider (or Not Consider) Lonely Phlox?

Reasons you might want to grow it:

  • Supporting rare Washington native biodiversity
  • Adding an extremely unique plant to your collection
  • Contributing to conservation efforts through cultivation

Practical challenges to consider:

  • Seeds or plants are likely unavailable through commercial sources
  • Growing requirements are largely unknown
  • Success rates would be unpredictable
  • May require specialized expertise to establish

Better Alternatives for Most Gardeners

If you’re inspired by the idea of growing native phlox in your Washington garden, consider these more readily available options:

  • Phlox speciosa (showy phlox) – a stunning Pacific Northwest native
  • Phlox diffusa (spreading phlox) – perfect for rock gardens
  • Phlox longifolia (longleaf phlox) – adaptable to various conditions

These alternatives offer the beauty and ecological benefits of native phlox while being much more practical for home gardeners.

The Bigger Picture

The lonely phlox reminds us that Washington’s native flora includes many species that remain poorly understood. While we may not be able to easily grow this particular plant, we can support rare native species by:

  • Protecting wild habitats where they naturally occur
  • Growing other native plants that support local ecosystems
  • Supporting botanical research and conservation efforts
  • Choosing well-documented native alternatives for our gardens

Sometimes the most responsible approach to rare plants is admiring them from afar while focusing our gardening efforts on native species we can successfully cultivate. The lonely phlox may prefer to stay lonely in the wild, and that’s perfectly okay.

Lonely 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 solivagus Mayfield & Darrach - lonely phlox

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