North America Native Plant

Hoary Tansyaster

Botanical name: Machaeranthera canescens canescens var. incana

USDA symbol: MACAI2

Life cycle: biennial

Habit: forb

Native status: Native to Canada âš˜ Native to the lower 48 states  

Synonyms: Aster attenuatus (Howell) M. Peck, non Lindl. ex Hook. (ASAT5)  âš˜  Aster tephrodes (A. Gray) S.F. Blake (ASTE18)  âš˜  Dieteria incana (Lindl.) Torr. & A. Gray (DIIN3)  âš˜  Diplopappus incanus Lindl. (DIIN4)  âš˜  Machaeranthera attenuata Howell (MAAT)  âš˜  Machaeranthera canescens (Pursh) A. Gray var. tephrodes A. Gray (MACAT)  âš˜  Machaeranthera incana (Lindl.) Greene (MAIN9)  âš˜  Machaeranthera tephrodes (A. Gray) Greene (MATE)   

Hoary Tansyaster: A Native Western Beauty for Your Garden If you’re looking to add some authentic western charm to your garden, the hoary tansyaster might just be the native gem you’ve been searching for. This unassuming yet resilient wildflower brings a touch of the American West right to your backyard, ...

Hoary Tansyaster: A Native Western Beauty for Your Garden

If you’re looking to add some authentic western charm to your garden, the hoary tansyaster might just be the native gem you’ve been searching for. This unassuming yet resilient wildflower brings a touch of the American West right to your backyard, and it’s got some pretty impressive credentials to back up its garden-worthy status.

What Exactly Is Hoary Tansyaster?

Hoary tansyaster (Machaeranthera canescens canescens var. incana) is a true native plant that calls the western regions of North America home. This hardy little forb – that’s garden-speak for a non-woody flowering plant – has been quietly beautifying the western landscape long before any of us thought about cultivated gardens.

What makes this plant particularly interesting is its flexible lifestyle. Depending on conditions, hoary tansyaster can live as an annual (completing its life cycle in one year), a biennial (taking two years), or even as a perennial (coming back year after year). It’s like nature’s way of keeping its options open!

Where Does It Call Home?

This native beauty has quite an impressive range across the western regions. You’ll find hoary tansyaster naturally growing throughout British Columbia, California, Idaho, Oregon, and Washington. It’s truly a plant of both the United States and Canada, making it a authentic North American native.

Why Consider Hoary Tansyaster for Your Garden?

Here’s where things get exciting for native plant enthusiasts. Choosing hoary tansyaster means you’re:

  • Supporting local ecosystems by planting a true native species
  • Adding a plant that’s naturally adapted to western growing conditions
  • Choosing a flexible plant that can adapt its growing strategy to your garden’s conditions
  • Embracing a piece of authentic western botanical heritage

As a forb, this plant won’t dominate your garden with woody growth, but it will provide that soft, herbaceous texture that plays so well with other native plants and traditional garden favorites alike.

The Reality Check

Now, let’s be honest – hoary tansyaster isn’t the flashiest plant you’ll ever encounter. It’s more of a supporting cast member than a garden diva. But sometimes that’s exactly what a garden needs: reliable, authentic, and perfectly suited to local conditions.

The challenge with this particular variety is that detailed growing information can be somewhat limited compared to more common garden plants. This means you might need to do a bit of detective work or connect with local native plant societies to get the most specific growing advice.

Making It Work in Your Space

Since hoary tansyaster is a native forb with such flexibility in its growing strategy, it’s likely quite adaptable to different garden situations. Native plants are generally excellent choices for:

  • Water-wise gardens
  • Natural or wildflower-style landscapes
  • Mixed borders with other western natives
  • Areas where you want low-maintenance, regionally appropriate plants

The Bottom Line

Hoary tansyaster represents the kind of plant that serious native gardeners get excited about – authentic, regionally appropriate, and ecologically valuable. While it might not have the detailed growing guides of hybrid roses or the instant recognition of popular perennials, it offers something perhaps more valuable: a genuine connection to the natural heritage of western North America.

If you’re building a native plant garden, creating wildlife habitat, or simply want to try something uniquely suited to the western regions, hoary tansyaster deserves a spot on your consideration list. Just be prepared to appreciate subtlety over showiness – sometimes the most interesting plants are the ones that whisper rather than shout.

For the best growing success, we’d recommend connecting with local native plant groups or extension services in your area. They’ll have the most specific advice for helping this authentic western native thrive in your particular corner of its natural range.

Hoary Tansyaster

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

Asterales

Family

Asteraceae Bercht. & J. Presl - Aster family

Genus

Machaeranthera Nees - tansyaster

Species

Machaeranthera canescens (Pursh) A. Gray - hoary tansyaster

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