North America Native Plant

Green Buckwheat

Botanical name: Eriogonum umbellatum var. glaberrimum

USDA symbol: ERUMG

Life cycle: perennial

Habit: subshrub

Native status: Native to the lower 48 states  

Green Buckwheat: A Charming Native Perennial for Water-Wise Gardens If you’re looking for a low-maintenance native plant that thrives in dry conditions and supports local wildlife, green buckwheat might just be your new garden favorite. This unassuming perennial herb packs a surprising punch with its delicate yellow flowers and silvery ...

Rare plant alert!

Region: Conservation status by state

Status: S5T2?: Status is uncertain but is somewhere between the following rankings: Inexact rank: ⚘ 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) ⚘ 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. ⚘

Green Buckwheat: A Charming Native Perennial for Water-Wise Gardens

If you’re looking for a low-maintenance native plant that thrives in dry conditions and supports local wildlife, green buckwheat might just be your new garden favorite. This unassuming perennial herb packs a surprising punch with its delicate yellow flowers and silvery foliage, making it a delightful addition to drought-tolerant landscapes.

What is Green Buckwheat?

Green buckwheat (Eriogonum umbellatum var. glaberrimum) is a native perennial forb that belongs to the diverse buckwheat family. As a forb, it’s a non-woody plant that lacks significant woody tissue above ground, instead relying on underground buds to survive through seasons. Don’t let its humble description fool you – this little powerhouse is perfectly adapted to western climates and brings both beauty and ecological value to your garden.

Where Does It Grow Naturally?

This variety of buckwheat is native to the western United States, specifically thriving in California and Oregon. It has adapted beautifully to the Mediterranean and semi-arid climates of these regions, making it an excellent choice for gardeners in similar conditions.

A Note About Conservation

Before you rush to plant green buckwheat, there’s something important to know: this variety has a conservation status of S5T2?, which indicates some uncertainty about its population status. While this doesn’t mean you shouldn’t grow it, it does mean you should be thoughtful about sourcing. Always purchase from reputable native plant nurseries that propagate their stock rather than collecting from wild populations.

Why Choose Green Buckwheat for Your Garden?

Green buckwheat offers several compelling reasons to earn a spot in your landscape:

  • Drought tolerance: Once established, it requires minimal supplemental watering
  • Pollinator magnet: The small yellow flowers arranged in attractive umbel clusters attract butterflies, native bees, and other beneficial insects
  • Low maintenance: This tough little plant thrives on neglect once it’s settled in
  • Native authenticity: Supporting local ecosystems by choosing plants that belong in your region
  • Unique texture: The silvery-green foliage adds interesting contrast to garden compositions

Perfect Garden Settings

Green buckwheat shines in several garden styles:

  • Rock gardens: Its compact form and drought tolerance make it ideal for rocky, well-draining spots
  • Native plant gardens: A natural choice for authentic regional landscapes
  • Water-wise gardens: Perfect for xerophytic landscaping where water conservation is key
  • Ground cover applications: Can spread to form attractive, low-growing carpets

Growing Conditions That Make It Happy

Green buckwheat is remarkably adaptable, but it does have some preferences:

  • Sunlight: Full sun is best for optimal flowering and compact growth
  • Soil: Well-draining soil is absolutely essential – soggy conditions are this plant’s nemesis
  • Water: Drought tolerant once established, but benefits from occasional deep watering during extreme dry spells
  • Climate: Hardy in USDA zones 5-9, making it suitable for a wide range of western gardens

Planting and Care Tips

Getting green buckwheat established successfully is straightforward if you follow these guidelines:

  • Timing: Plant in fall or early spring when temperatures are moderate
  • Soil preparation: Ensure excellent drainage – amend heavy soils with gravel or coarse sand if needed
  • Spacing: Allow adequate room for spreading, as mature plants can form attractive colonies
  • Initial watering: Provide regular water during the first growing season to help establish roots
  • Ongoing care: Once established, water sparingly and avoid fertilizing, which can make the plant leggy
  • Pruning: Minimal pruning needed – just remove spent flowers if desired, though many gardeners leave them for wildlife

Supporting Wildlife

One of green buckwheat’s greatest contributions to your garden ecosystem is its appeal to pollinators. The umbrella-shaped flower clusters provide an excellent landing platform for butterflies and native bees, while the extended blooming period offers consistent nectar sources throughout the growing season.

Is Green Buckwheat Right for Your Garden?

Green buckwheat is an excellent choice if you’re gardening in California or Oregon and want to incorporate native plants that support local wildlife while requiring minimal resources. Its drought tolerance makes it particularly valuable in areas with water restrictions or naturally dry conditions.

However, remember to source responsibly due to its uncertain conservation status. By choosing propagated plants from reputable nurseries, you can enjoy this lovely native while supporting conservation efforts.

With its charming flowers, ecological benefits, and easy-care nature, green buckwheat proves that sometimes the best garden additions are the ones that have been thriving in your region all along. Give this native gem a try – your local pollinators will thank you!

Green 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 umbellatum Torr. - sulphur-flower buckwheat

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