How to Grow Sulphur Flower Buckwheat 'Flame'
Sulphur Flower Buckwheat 'Flame'
Eriogonum umbellatum 'Flame'
shrubEriogonum umbellatum 'Flame' is a compact, drought-tolerant perennial subshrub native to western North America, prized for its striking flower color that transitions from pale yellow to deep red-orange as blooms age. This alpine plant forms dense mounds of blue-green foliage and produces charming umbel flower clusters that attract pollinators throughout summer. It is an excellent choice for rock gardens, alpine troughs, and xeriscape landscapes.
When should you plant Sulphur Flower Buckwheat 'Flame' in your zone?
Get a personalized planting timeline — when to start seeds, transplant, and harvest — based on your USDA zone and local frost dates. Free to start.
Example Sulphur Flower Buckwheat 'Flame' timeline · Pittsburgh, PA (Zone 6b)
-
Plant Sulphur Flower Buckwheat 'Flame'
Around Apr 17Near Pittsburgh's average last spring frost.
-
Tend & protect
Late spring–summerWatering, feeding, and pest-watch reminders.
-
Harvest Sulphur Flower Buckwheat 'Flame'
Late summer into fallBefore the first fall frost (≈ Nov 8)
Sample dates for Pittsburgh, PA. Sign up to get exact Sulphur Flower Buckwheat 'Flame' dates for your own zip code.
Growing Conditions
Soil
Growing Zones
Find your zone →Thrives in zones 4-8; hardy to zone 3 with good drainage
Sign up free to see if Sulphur Flower Buckwheat 'Flame' grows in your zone — and get a personalized planting timeline.
Get my Sulphur Flower Buckwheat 'Flame' timeline →Growth Stages
Seedling
3-4 weeksTiny seedlings emerge 10-14 days after sowing with fine cotyledons and developing true leaves. Growth is slow initially.
Keep soil lightly moist but not wet. Provide bright light to prevent leggy growth. Ensure excellent drainage to avoid damping off. Do not fertilize at this stage.
Vegetative Growth
4-8 weeksPlant develops rosette of blue-green, narrow leaves in tight mounds. Foliage is silvery and somewhat succulent-like in texture.
Reduce watering as plant establishes. Ensure drainage remains excellent. Minimal fertilizer needed; too much nitrogen promotes lush growth susceptible to rot. Mulch around base with gravel, not organic material.
Bud Formation
2-3 weeksFlower stalks emerge from the center of foliage rosettes. Umbel flower clusters form at stalk tips with buds initially tightly clustered.
Continue minimal watering. Do not fertilize. Ensure full sun exposure for vibrant flower color development. Remove any dead or diseased foliage.
Flowering
6-10 weeks or moreShowy umbel clusters open with small pale yellow flowers that transition to fiery red-orange as they mature, creating a striking two-tone effect. Individual flowers are tiny but clustered dramatically.
Maintain dry conditions; do not water foliage. Deadhead spent flower clusters to encourage continued blooming if desired, though plants often self-seed. Monitor for pests attracted to flowers.
Seed Production & Dormancy
4-8 weeks into winter dormancyFlowers fade and transition to seed heads with three-winged seed pods. Foliage may persist through winter in most zones; semi-evergreen character.
Allow seed heads to remain for self-seeding or collect seeds before they disperse. Withhold water and allow plant to harden off. In harsh winters, ensure excellent drainage to prevent crown rot. No supplemental water needed.
Companion Planting
Plan your garden →Plant with:
Avoid planting near:
Common Pests
-
Strong water spray to dislodge; insecticidal soap if severe. Rarely problematic on established plants in full sun.
-
Increase humidity slightly; spray undersides of leaves with water. Predatory mites help control populations.
-
Reduce watering frequency; allow soil to dry between waterings. Use gnat traps if indoors.
Uses
Pollinator Magnet
WildlifeEriogonum umbellatum 'Flame' attracts bees, butterflies, and other pollinators throughout the summer blooming period with its nectar-rich flowers. The plant is particularly valuable for native bee populations in western regions. [source]
Rock & Alpine Gardens
HouseholdIdeal specimen for rock gardens, alpine troughs, scree gardens, and container cultivation. The compact mounding form and year-round ornamental appeal make it excellent for landscape structure. [source]
Dried Flower Arrangements
CraftFlower clusters can be dried for long-lasting arrangements and retain color well. The distinctive bicolor blooms add texture and warmth to dried bouquets. [source]
Xeriscape & Low-Water Landscaping
HouseholdExceptional drought tolerance makes this cultivar perfect for water-conservation landscapes, rain gardens, and regions with limited irrigation. Requires minimal maintenance once established. [source]
Harvest Tips
Not typically harvested for consumption or commercial use. For seeds: allow flower clusters to dry on plant, then collect seed heads before shattering (late summer to early fall). Store seeds in cool, dry place. For garden display: cut flower clusters when color is most vibrant (typically mid to late summer); flowers last 1-2 weeks in water but are primarily ornamental.
Fun Facts
- 🌱 The common name 'Sulphur Flower' refers to the pale yellow initial flower color, which deepens to flame-red as the flower ages—creating a beautiful gradient effect across the entire flower cluster.
- 🌱 Eriogonum umbellatum is native to high-elevation rocky areas of the western United States and Canada, and 'Flame' is a specially selected cultivar bred for enhanced flower color intensity and garden performance.
- 🌱 This plant was historically used by Native Americans for various purposes and has been an important native wildflower in alpine restoration projects throughout the Rocky Mountains and Sierra Nevada.
Gardening Terms
New to gardening? Learn about terms used in this guide:
Join 30,000 gardeners planning their gardens with LizPlants.
Get your personalized Sulphur Flower Buckwheat 'Flame' planting timeline
Tell us your zip code and we'll calculate exactly when to start Sulphur Flower Buckwheat 'Flame' seeds, transplant seedlings, and harvest — based on your USDA zone and local frost dates. Includes calendar reminders and printable task lists. Free to start.
Get my Sulphur Flower Buckwheat 'Flame' timeline →