North America Native Plant

Phlox

Botanical name: Phlox ×rugelii

USDA symbol: PHRU3

Life cycle: perennial

Habit: forb

Native status: Native to the lower 48 states  

Discovering Phlox ×rugelii: Tennessee’s Elusive Native Hybrid Meet Phlox ×rugelii, one of those fascinating native plants that seems to prefer staying under the radar. This perennial hybrid is like the shy kid in the back of the native plant classroom – present, but not making much noise about it. If ...

Discovering Phlox ×rugelii: Tennessee’s Elusive Native Hybrid

Meet Phlox ×rugelii, one of those fascinating native plants that seems to prefer staying under the radar. This perennial hybrid is like the shy kid in the back of the native plant classroom – present, but not making much noise about it. If you’re a gardener who loves hunting down rare and unusual natives, this Tennessee treasure might just pique your interest.

What Makes This Phlox Special?

Phlox ×rugelii is a native hybrid that calls Tennessee home exclusively. The × in its name is botanist-speak for this is a hybrid, meaning it’s the result of two different Phlox species getting together and creating something new. Think of it as nature’s own plant breeding experiment, happening right in the wild without any human intervention.

As a perennial forb, this plant lacks the woody stems you’d find on shrubs or trees. Instead, it’s one of those herbaceous plants that dies back to the ground each winter and pops up again in spring, storing its energy in underground parts during the off-season.

Where You’ll Find It (Or Won’t)

This particular phlox has chosen Tennessee as its exclusive stomping ground. It’s not spreading its wings to other states – at least not that we know of. This limited distribution makes it something of a botanical unicorn.

The Challenge of Growing Phlox ×rugelii

Here’s where things get a bit tricky. While this native hybrid certainly has the native plant street cred that many gardeners seek, finding detailed growing information – let alone the plant itself – is like trying to find a needle in a haystack. The gardening world simply doesn’t have much documentation about this particular hybrid’s preferences, growth habits, or care requirements.

This lack of information presents both a challenge and an opportunity:

  • Challenge: You can’t easily find growing guides or nursery sources
  • Opportunity: You could be one of the few gardeners to experiment with this rare native

What This Means for Your Garden

If you’re dead set on growing native Tennessee plants and have your heart set on this particular phlox, you’ll need to become something of a plant detective. Since specific growing conditions aren’t well-documented, you’d need to:

  • Research its parent species to get clues about potential growing needs
  • Connect with Tennessee native plant societies or botanical experts
  • Look for responsibly sourced material (never wild-collect)

Alternative Native Phlox Options

While Phlox ×rugelii might be playing hard to get, Tennessee and surrounding areas are home to several other beautiful native phlox species that are better documented and more readily available:

  • Wild Sweet William (Phlox divaricata) – perfect for woodland gardens
  • Summer Phlox (Phlox paniculata) – a showstopper for sunny borders
  • Moss Phlox (Phlox subulata) – excellent for rock gardens and slopes

The Bottom Line

Phlox ×rugelii represents the fascinating world of native plant diversity that exists right under our noses. While this Tennessee hybrid might not be the easiest addition to your garden toolkit, it reminds us that there’s still so much to discover about our native flora. Sometimes the most interesting plants are the ones that keep us guessing.

If you’re a beginning native plant gardener, you might want to start with better-documented native phlox species and work your way up to the more mysterious ones. But if you’re an experienced native plant enthusiast looking for a challenge, tracking down information about Phlox ×rugelii could be your next great adventure in native gardening.

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 ×rugelii Brand (pro sp.) [amoena × divaricata] - phlox

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