North America Native Plant

Frankton Dock

Botanical name: Rumex ×franktonis

USDA symbol: RUFR6

Life cycle: perennial

Habit: forb

Native status: Native to Canada  

Frankton Dock: A Mysterious Native Canadian Perennial If you’ve stumbled across the name Frankton dock in your native plant research, you’ve discovered one of Canada’s more enigmatic botanical residents. Rumex ×franktonis, as botanists know it, is a perennial forb that calls the Canadian prairies home—but don’t expect to find much ...

Frankton Dock: A Mysterious Native Canadian Perennial

If you’ve stumbled across the name Frankton dock in your native plant research, you’ve discovered one of Canada’s more enigmatic botanical residents. Rumex ×franktonis, as botanists know it, is a perennial forb that calls the Canadian prairies home—but don’t expect to find much about it in your typical gardening guides.

What Exactly Is Frankton Dock?

Frankton dock belongs to the vast Rumex genus, commonly known as docks or sorrels. The × symbol in its scientific name tells us something interesting: this is a hybrid species, meaning it’s the offspring of two different dock species that decided to get together and create something new. Like many plant hybrids, Frankton dock represents nature’s own experimental garden.

As a perennial forb, this plant lacks the woody stems of shrubs and trees, instead dying back to the ground each winter and returning from its root system when spring arrives. It’s what botanists call a herbaceous plant—think of it as nature’s version of a comeback kid.

Where You’ll Find This Prairie Native

Frankton dock is native to Canada, with its known range limited to Saskatchewan. This makes it a true prairie specialist, adapted to the unique conditions of Canada’s grassland region. Its limited distribution suggests it’s either highly specialized in its habitat requirements or simply hasn’t been extensively studied and documented.

The Challenge of Growing Frankton Dock

Here’s where things get tricky for the enthusiastic native plant gardener: information about cultivating Frankton dock is practically non-existent. This isn’t necessarily because it’s impossible to grow, but rather because it appears to be rarely cultivated or studied in detail.

What We Don’t Know (And Why That Matters)

The honest truth about Rumex ×franktonis is that many details remain mysteries:

  • Specific growing conditions and soil preferences
  • Mature size and growth rate
  • Flower characteristics and timing
  • Wildlife and pollinator relationships
  • Propagation methods
  • Landscape design applications

This lack of information doesn’t make Frankton dock less valuable—it just makes it more of an adventure for dedicated native plant enthusiasts.

Should You Try Growing It?

If you’re in Saskatchewan and passionate about native plants, Frankton dock could be an intriguing addition to your garden—if you can find it. However, given the limited information available, you’d essentially be conducting your own botanical experiment.

For most gardeners interested in native dock species, you might consider better-documented relatives like curly dock or sheep sorrel, though these aren’t native to North America. Alternatively, explore other native Saskatchewan forbs that are better understood and more readily available.

The Bottom Line

Frankton dock represents one of those fascinating gaps in our horticultural knowledge. It’s a reminder that even in our well-connected world, some plants remain beautifully mysterious. While it might not be the easiest choice for your native plant garden, it certainly sparks curiosity about the hidden botanical treasures in Canada’s prairie landscape.

If you’re determined to learn more about this elusive native, consider connecting with botanical societies in Saskatchewan or researchers studying prairie flora. Who knows? You might help unlock some of the secrets of this enigmatic prairie dweller.

Frankton Dock

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

Polygonales

Family

Polygonaceae Juss. - Buckwheat family

Genus

Rumex L. - dock

Species

Rumex ×franktonis B. Boivin [pseudonatronatus × salicifolius] - Frankton dock

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