North America Native Plant

Bastard Toadflax

Botanical name: Comandra umbellata umbellata

USDA symbol: COUMU

Life cycle: perennial

Habit: subshrub

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

Synonyms: Comandra richardsiana Fernald (CORI3)   

Bastard Toadflax: A Humble Native with Hidden Charms Don’t let the unfortunate common name fool you – bastard toadflax (Comandra umbellata umbellata) is actually a delightful native perennial that deserves a closer look. This unassuming little herb might not win any beauty contests, but it’s got some serious staying power ...

Bastard Toadflax: A Humble Native with Hidden Charms

Don’t let the unfortunate common name fool you – bastard toadflax (Comandra umbellata umbellata) is actually a delightful native perennial that deserves a closer look. This unassuming little herb might not win any beauty contests, but it’s got some serious staying power and plays an important role in North American ecosystems.

What is Bastard Toadflax?

Bastard toadflax is a native North American perennial herb that belongs to the sandalwood family. Despite its modest appearance, this hardy little plant has been quietly thriving across the continent for thousands of years. It’s also known by the synonym Comandra richardsiana Fernald, though most gardeners will encounter it under its more common botanical name.

As a forb (that’s just a fancy way of saying a non-woody flowering plant), bastard toadflax lacks the substantial stems of shrubs and trees. Instead, it forms low-growing clumps with simple, alternate leaves and produces small clusters of tiny, greenish-white flowers that appear almost insignificant at first glance.

Where Does It Grow?

One of the most impressive things about bastard toadflax is its incredible range. This adaptable native can be found from coast to coast, thriving in an amazing variety of climates and conditions. It grows naturally across Canada from British Columbia to Newfoundland and Labrador, and throughout most of the United States from Alabama to North Dakota.

This extensive distribution is a testament to the plant’s remarkable adaptability and hardiness, making it an excellent choice for gardeners in USDA zones 2-8.

Why Plant Bastard Toadflax?

While it might not be the showiest plant in your garden, bastard toadflax offers several compelling reasons to give it a try:

  • True native status: Supporting local ecosystems by planting species that evolved right in your backyard
  • Incredibly low maintenance: Once established, this tough little plant pretty much takes care of itself
  • Drought tolerance: Perfect for water-wise gardening and areas with challenging growing conditions
  • Cold hardy: Survives brutal winters that would kill less hardy plants
  • Wildlife support: Small flowers attract various beneficial insects including native bees, flies, and beetles
  • Ground cover potential: Forms modest colonies that can help fill in naturalized areas

Where to Use It in Your Landscape

Bastard toadflax works best in naturalized settings rather than formal garden beds. Consider incorporating it into:

  • Native plant gardens and prairie restorations
  • Woodland understory plantings
  • Naturalized areas where you want low-maintenance ground cover
  • Rock gardens or areas with challenging growing conditions
  • Wildlife habitat gardens focused on supporting pollinators

Don’t expect it to be a garden centerpiece – think of it more as a supporting player that adds ecological value and helps create authentic native plant communities.

Growing Conditions and Care

One of bastard toadflax’s greatest strengths is its adaptability. This resilient native can handle:

  • Sun exposure: Full sun to partial shade
  • Soil types: Various well-draining soils, from sandy to clay
  • Moisture: Drought tolerant once established, though it appreciates occasional watering during extended dry periods
  • pH: Adaptable to different soil pH levels

Planting and Care Tips

Growing bastard toadflax is refreshingly straightforward:

  • Starting: Can be grown from seed or established through division of existing plants
  • Planting time: Spring or fall planting works well
  • Spacing: Give plants about 12-18 inches of space to allow for natural spreading
  • Maintenance: Minimal care needed – just ensure good drainage and avoid overwatering
  • Fertilizing: Generally unnecessary, as native plants prefer lean soils

Here’s something fascinating: bastard toadflax is semi-parasitic, meaning it can tap into the root systems of nearby plants for additional nutrients. Don’t worry – it’s not harmful to its host plants and this relationship is completely natural.

The Bottom Line

While bastard toadflax might not be the most glamorous addition to your garden, it’s exactly the kind of humble, hardworking native that helps create authentic, sustainable landscapes. If you’re looking to support local wildlife, reduce maintenance, and add genuine ecological value to your outdoor space, this unassuming little herb might be exactly what you need.

Sometimes the best plants are the ones that don’t demand attention – they just quietly do their job, year after year, supporting the web of life that makes our gardens truly come alive.

Bastard Toadflax

Classification

Group

Dicot

Kingdom

Plantae - Plants

Subkingdom

Tracheobionta - Vascular plants

Superdivision

Spermatophyta - Seed plants

Division

Magnoliophyta - Flowering plants

Subdivision
Class

Magnoliopsida - Dicotyledons

Subclass

Rosidae

Order

Santalales

Family

Santalaceae R. Br. - Sandalwood family

Genus

Comandra Nutt. - bastard toadflax

Species

Comandra umbellata (L.) Nutt. - bastard toadflax

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