North America Native Plant

Slender Buckwheat

Botanical name: Eriogonum microthecum var. microthecum

USDA symbol: ERMIM2

Life cycle: perennial

Habit: subshrub

Native status: Native to the lower 48 states  

Synonyms: Eriogonum microthecum Nutt. var. idahoense (Rydb.) S. Stokes (ERMII)   

Slender Buckwheat: A Hidden Gem for Water-Wise Gardens If you’re looking for a tough, drought-tolerant shrub that doesn’t compromise on beauty, let me introduce you to slender buckwheat (Eriogonum microthecum var. microthecum). This unassuming native plant might just become your new favorite addition to a water-wise landscape. What Makes Slender ...

Rare plant alert!

Region: Conservation status by state

Status: S5T2T3: Status is uncertain but is somewhere between the following rankings: Subspecies or variety is imperiled: Extremely rare due to factor(s) making it especially vulnerable to extinction. Typically 6 to 20 occurrences or few remaining individuals (1,000 to 3,000) ⚘ Subspecies or variety is vulnerable: Either very rare and local throughout its range, found only in a restricted range (even if abundant at some locations), or factors are making it vulnerable to extinction. Typically 21 to 100 occurrences or between 3,000 and 10,000 individuals. ⚘ Secure: At very low or no risk of extinction in the jurisdiction due to a very extensive range, abundant populations or occurrences, with little to no concern from declines or threats. ⚘

Slender Buckwheat: A Hidden Gem for Water-Wise Gardens

If you’re looking for a tough, drought-tolerant shrub that doesn’t compromise on beauty, let me introduce you to slender buckwheat (Eriogonum microthecum var. microthecum). This unassuming native plant might just become your new favorite addition to a water-wise landscape.

What Makes Slender Buckwheat Special?

Slender buckwheat is a perennial shrub that brings both form and function to your garden. This multi-stemmed woody plant typically stays compact, rarely exceeding 13 to 16 feet in height, though most specimens remain much smaller. What it lacks in size, it makes up for in character, with silvery-green foliage that provides year-round interest and clusters of small white to cream flowers that appear in summer.

Don’t let the name fool you – this isn’t related to the grain buckwheat you might find in your pantry. Instead, it’s part of the wild buckwheat family, known for their incredible ability to thrive in challenging conditions.

Where Does Slender Buckwheat Call Home?

This tough little shrub is native to the western United States, specifically found growing wild in Idaho and Oregon. As a native species to the lower 48 states, it has evolved to thrive in the unique conditions of the Great Basin region.

Why Consider Slender Buckwheat for Your Garden?

There are several compelling reasons to give slender buckwheat a spot in your landscape:

  • Water-wise champion: Once established, this plant thrives on minimal water, making it perfect for drought-prone areas
  • Pollinator magnet: The nectar-rich flowers attract bees, butterflies, and other beneficial insects
  • Low maintenance: After the initial establishment period, it practically takes care of itself
  • Year-round interest: The attractive foliage provides structure and color even when not in bloom
  • Native plant benefits: Supporting local ecosystems and wildlife

Perfect Garden Settings

Slender buckwheat shines in specific garden styles and locations:

  • Xeriscape and drought-tolerant gardens
  • Rock gardens and alpine-style landscapes
  • Native plant gardens
  • Naturalized areas and wildlife gardens
  • Slopes and areas with challenging growing conditions

Growing Conditions and Care

The beauty of slender buckwheat lies in its simplicity. This plant thrives in conditions that would stress many other garden favorites:

  • Sunlight: Full sun is essential for best performance
  • Soil: Well-draining soil is crucial; it actually prefers lean, alkaline conditions
  • Hardiness: Hardy in USDA zones 4-8
  • Water: Drought tolerant once established; overwatering is more harmful than underwatering

Planting and Establishment Tips

Getting slender buckwheat off to a good start is straightforward:

  • Plant in spring after the last frost
  • Choose a sunny location with excellent drainage
  • Water regularly during the first growing season to help establish roots
  • After establishment, reduce watering significantly
  • Prune lightly after flowering if desired, but it’s not necessary
  • Avoid fertilizing – this plant prefers lean conditions

A Word About Conservation

Slender buckwheat has a conservation status that suggests some populations may be limited in certain areas. If you decide to add this plant to your garden, make sure to source it responsibly from reputable native plant nurseries that propagate their own stock rather than wild-collecting.

Is Slender Buckwheat Right for You?

This plant is ideal for gardeners who want to embrace sustainable, low-water landscaping without sacrificing beauty. It’s perfect for those challenging spots where other plants struggle, and it rewards neglect better than attention. However, if you prefer lush, high-maintenance gardens or have heavy, poorly-draining soil, you might want to consider other options or improve your soil drainage first.

Slender buckwheat proves that sometimes the most undemanding plants offer the greatest rewards. With its combination of drought tolerance, pollinator appeal, and understated beauty, it deserves consideration for any water-wise garden in its native range.

Slender 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