North America Native Plant

Sulphur-flower Buckwheat

Botanical name: Eriogonum umbellatum var. hypoleium

USDA symbol: ERUMH3

Life cycle: perennial

Habit: subshrub

Native status: Native to the lower 48 states  

Sulphur-Flower Buckwheat: A Golden Native Gem for Your Garden If you’re looking for a native plant that brings sunshine to your garden while requiring minimal fuss, sulphur-flower buckwheat (Eriogonum umbellatum var. hypoleium) might just be your new best friend. This delightful Pacific Northwest native is like that reliable friend who ...

Rare plant alert!

Region: Conservation status by state

Status: S5T2T4: 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 varieties is apparently secure: Uncommon but not rare, and usually widespread. Possibly cause for longterm concern. Typically more than 100 occurrences in the region or more than 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. ⚘

Sulphur-Flower Buckwheat: A Golden Native Gem for Your Garden

If you’re looking for a native plant that brings sunshine to your garden while requiring minimal fuss, sulphur-flower buckwheat (Eriogonum umbellatum var. hypoleium) might just be your new best friend. This delightful Pacific Northwest native is like that reliable friend who always shows up looking great and never asks for much in return.

What Makes Sulphur-Flower Buckwheat Special?

Sulphur-flower buckwheat is a perennial forb that belongs to the buckwheat family. Don’t let the forb classification intimidate you – it simply means this is an herbaceous flowering plant without woody stems, making it perfect for gardeners who want color without the commitment of shrubs or trees.

This native beauty is naturally found in Washington state, where it has adapted to thrive in the region’s unique growing conditions. As a true native, it plays an important role in supporting local ecosystems and wildlife.

A Visual Treat That Changes with the Seasons

One of the most charming features of sulphur-flower buckwheat is its ever-changing flower display. The plant produces dense, umbrella-like clusters of tiny flowers that start as bright, cheerful yellow blooms. As the season progresses, these flowers gradually shift to warm orange and eventually deep red tones, creating a stunning color progression that keeps your garden interesting from spring through fall.

The silvery-green foliage provides an attractive backdrop for the colorful blooms and adds texture to your garden even when the plant isn’t flowering.

Perfect for Low-Maintenance Gardens

Here’s where sulphur-flower buckwheat really shines – it’s incredibly low-maintenance once established. This drought-tolerant champion thrives in:

  • Full sun locations
  • Well-drained soils
  • Rock gardens and xeriscapes
  • Native plant gardens
  • Naturalistic landscapes

It’s particularly well-suited for USDA hardiness zones 4-8, making it a reliable choice for most temperate gardens.

A Pollinator Magnet

Your local bees and butterflies will thank you for adding sulphur-flower buckwheat to your garden. The nectar-rich flowers are a valuable food source for pollinators, and the long blooming season means you’ll be supporting these important insects throughout much of the growing season.

Growing Sulphur-Flower Buckwheat Successfully

The good news is that growing this native beauty is refreshingly straightforward:

  • Planting time: Spring or fall are ideal for planting
  • Location: Choose a spot with full sun and excellent drainage
  • Watering: Water regularly during the first growing season to establish roots, then reduce watering significantly
  • Soil: Well-drained soil is essential – this plant does not tolerate soggy conditions
  • Maintenance: Minimal care needed once established; avoid over-fertilizing or overwatering

A Word About Responsible Sourcing

Sulphur-flower buckwheat has a conservation status that suggests it may be somewhat rare in parts of its range. If you’re interested in adding this plant to your garden, make sure to source it from reputable native plant nurseries that propagate their plants rather than collecting from wild populations.

Is Sulphur-Flower Buckwheat Right for Your Garden?

This native gem is perfect for gardeners who:

  • Want to support local wildlife and pollinators
  • Prefer low-maintenance, drought-tolerant plants
  • Are creating rock gardens or xeric landscapes
  • Appreciate plants with changing seasonal interest
  • Want to incorporate more native plants into their landscape

With its cheerful flowers, easy-care nature, and important ecological benefits, sulphur-flower buckwheat proves that native plants can be both beautiful and practical. It’s a wonderful way to bring a piece of the Pacific Northwest’s natural beauty into your own backyard while supporting the local ecosystem – now that’s what we call a win-win!

Sulphur-flower 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