North America Native Plant

Mt. Eddy Buckwheat

Botanical name: Eriogonum umbellatum var. humistratum

USDA symbol: ERUMH2

Life cycle: perennial

Habit: subshrub

Native status: Native to the lower 48 states  

Mt. Eddy Buckwheat: A Charming California Native for Rock Gardens and Dry Landscapes If you’re looking for a tough-as-nails ground cover that can handle California’s challenging growing conditions while still putting on a beautiful show, meet Mt. Eddy buckwheat (Eriogonum umbellatum var. humistratum). This delightful native perennial might just be ...

Rare plant alert!

Region: Conservation status by state

Status: S5T3: Status is uncertain but is somewhere between the following rankings: 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. ⚘

Mt. Eddy Buckwheat: A Charming California Native for Rock Gardens and Dry Landscapes

If you’re looking for a tough-as-nails ground cover that can handle California’s challenging growing conditions while still putting on a beautiful show, meet Mt. Eddy buckwheat (Eriogonum umbellatum var. humistratum). This delightful native perennial might just be the perfect addition to your drought-tolerant garden.

What Is Mt. Eddy Buckwheat?

Mt. Eddy buckwheat is a low-growing, mat-forming perennial herb native to California. As its name suggests, this special variety is closely associated with the Mt. Eddy area in northern California’s Klamath Mountains. Unlike its taller cousins in the buckwheat family, this variety stays refreshingly compact, making it perfect for smaller spaces and rock gardens.

This herbaceous perennial lacks woody stems above ground, instead forming spreading mats of silvery-green foliage that hug the earth. During summer, it produces clusters of small, cheerful flowers that range from bright yellow to creamy white, creating a stunning carpet of color against its attractive foliage.

Where Does It Grow Naturally?

Mt. Eddy buckwheat is endemic to California, where it thrives in the challenging conditions of the northern mountains. This makes it a true California native, perfectly adapted to the state’s Mediterranean climate and rocky soils.

Why Grow Mt. Eddy Buckwheat?

There are several compelling reasons to consider adding this native beauty to your landscape:

  • Drought tolerance: Once established, this plant requires minimal water, making it perfect for water-wise gardening
  • Pollinator magnet: The summer flowers attract native bees, butterflies, and other beneficial insects to your garden
  • Low maintenance: As a native plant, it’s naturally adapted to local conditions and requires little care
  • Year-round interest: The attractive silvery foliage provides visual appeal even when not in bloom
  • Erosion control: Its mat-forming habit helps stabilize slopes and prevent soil erosion

Perfect Garden Settings

Mt. Eddy buckwheat shines in several landscape applications:

  • Rock gardens: Its compact size and drought tolerance make it ideal for tucking between rocks
  • Alpine gardens: Perfect for recreating mountain meadow conditions
  • Xeriscape designs: An excellent choice for water-conserving landscapes
  • Native plant gardens: Adds authentic California character to indigenous plantings
  • Ground cover: Creates attractive, low-maintenance carpets in sunny areas

Growing Conditions and Care

Success with Mt. Eddy buckwheat comes from mimicking its natural mountain habitat:

Sunlight: Provide full sun for best flowering and compact growth. This plant needs at least 6-8 hours of direct sunlight daily.

Soil: Well-draining soil is absolutely crucial. Rocky, sandy, or gravelly soils work best. Heavy clay or constantly moist soils will likely cause root rot.

Water: Water regularly during the first growing season to establish roots, then reduce watering significantly. Once established, this plant is quite drought tolerant and may actually suffer from too much water.

Climate: Hardy in USDA zones 5-8, this plant can handle both cold winters and hot, dry summers.

Planting and Care Tips

  • Best planting time: Spring is ideal for planting, giving the plant time to establish before winter
  • Soil preparation: Amend heavy soils with coarse sand or gravel to improve drainage
  • Spacing: Allow adequate space for the plant to spread as a ground cover
  • Winter care: In areas with wet winters, ensure excellent drainage to prevent root rot
  • Pruning: Minimal pruning needed; just remove spent flower heads if desired

Important Conservation Note

Mt. Eddy buckwheat has a conservation status that requires some attention. If you’re interested in growing this plant, please ensure you source it from reputable native plant nurseries that use responsibly collected seeds or propagated material. Never collect plants or seeds from wild populations, as this can harm natural ecosystems.

The Bottom Line

Mt. Eddy buckwheat offers gardeners a chance to grow a truly special California native that’s both beautiful and environmentally beneficial. Its combination of drought tolerance, pollinator appeal, and low-maintenance nature makes it an excellent choice for modern sustainable landscaping. Just remember to source your plants responsibly and provide the well-draining conditions this mountain native craves.

Whether you’re creating a native plant garden, looking for drought-tolerant ground cover, or simply want to support local pollinators, Mt. Eddy buckwheat deserves serious consideration. Your garden – and the local ecosystem – will thank you for it!

Mt. Eddy 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