North America Native Plant

Simpson’s Buckwheat

Botanical name: Eriogonum microthecum var. simpsonii

USDA symbol: ERMIS2

Life cycle: perennial

Habit: subshrub

Native status: Native to the lower 48 states  

Synonyms: Eriogonum microthecum Nutt. var. foliosum (Torr. & A. Gray) Reveal (ERMIF)  âš˜  Eriogonum microthecum Nutt. var. friscanum (M.E. Jones) S. Stokes (ERMIF3)  âš˜  Eriogonum microthecum Nutt. ssp. intermedium S. Stokes (ERMII2)  âš˜  Eriogonum microthecum Nutt. var. macdougalii (Gandog.) S. Stokes (ERMIM3)  âš˜  Eriogonum simpsonii Benth. (ERSI8)   

Simpson’s Buckwheat: A Hardy Native Shrub for Water-Wise Gardens Meet Simpson’s buckwheat (Eriogonum microthecum var. simpsonii), a tough-as-nails native shrub that’s perfect for gardeners who want maximum impact with minimal effort. This unassuming little powerhouse proves that sometimes the best things come in small, drought-resistant packages! What is Simpson’s Buckwheat? ...

Simpson’s Buckwheat: A Hardy Native Shrub for Water-Wise Gardens

Meet Simpson’s buckwheat (Eriogonum microthecum var. simpsonii), a tough-as-nails native shrub that’s perfect for gardeners who want maximum impact with minimal effort. This unassuming little powerhouse proves that sometimes the best things come in small, drought-resistant packages!

What is Simpson’s Buckwheat?

Simpson’s buckwheat is a native perennial shrub that calls the American West home. As a true native of the lower 48 states, this plant has spent centuries perfecting the art of thriving in challenging conditions. It’s a multi-stemmed woody plant that typically stays under 13-16 feet tall, though in garden settings, you’ll usually see it much more compact and manageable.

Where Does It Grow Naturally?

This resilient native has claimed territory across seven western states: Arizona, California, Colorado, Nevada, New Mexico, Utah, and Wyoming. It’s particularly at home in the Great Basin and southwestern regions, where it has adapted to some pretty tough growing conditions.

Why Your Garden Will Love Simpson’s Buckwheat

Here’s where this plant really shines – it’s like having a beautiful, low-maintenance garden guest who never overstays their welcome:

  • Drought champion: Once established, this shrub laughs in the face of dry spells
  • Pollinator magnet: Those clusters of small white to cream (sometimes pink) flowers are bee and butterfly favorites
  • Year-round interest: Silvery-green foliage looks good even when not blooming, and seed heads add texture
  • Native benefits: Supporting local ecosystems while reducing maintenance needs

Perfect Garden Situations

Simpson’s buckwheat is particularly well-suited for:

  • Xeriscape and drought-tolerant landscapes
  • Rock gardens and naturalized areas
  • Native plant gardens
  • Low-water maintenance landscapes
  • Areas where you want groundcover that won’t need babying

Growing Conditions and Care

The beauty of Simpson’s buckwheat lies in its simplicity. This plant thrives in USDA hardiness zones 4-8, making it suitable for a wide range of climates.

What It Needs:

  • Sunlight: Full sun is ideal
  • Soil: Well-draining soil is non-negotiable – soggy feet are this plant’s kryptonite
  • Water: Minimal once established; drought tolerance is one of its superpowers
  • Fertilizer: None needed – it’s adapted to lean soils

Planting and Care Tips

Getting Simpson’s buckwheat established is refreshingly straightforward:

  • Timing: Plant in spring or fall for best establishment
  • Spacing: Give it room to spread naturally
  • Initial watering: Water regularly the first season to help roots establish
  • Long-term care: Step back and let it do its thing – minimal intervention needed
  • Pruning: Light pruning to shape if desired, but not necessary

The Bottom Line

Simpson’s buckwheat is the garden equivalent of that reliable friend who’s always there when you need them but never demands attention. It’s perfect for gardeners who want to support native wildlife, conserve water, and enjoy a beautiful landscape without the constant maintenance. Plus, knowing you’re growing something that truly belongs in your regional ecosystem? That’s gardening gold right there.

Whether you’re creating a full xeriscape or just looking for that perfect low-maintenance addition to your native plant collection, Simpson’s buckwheat deserves a spot on your shortlist. Your local pollinators will thank you, your water bill will thank you, and your future self will definitely thank you when you realize how easy this little shrub is to love.

Simpson’s Buckwheat

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

Eriogonum Michx. - buckwheat

Species

Eriogonum microthecum Nutt. - slender buckwheat

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