Mountain Goldenbanner
Thermopsis montana
Not currently listed at our partner nurseries.
Essentials
At a Glance
Plant Type
Perennial
Height
24 inches
Width
18 inches
Light
Full Sun, Partial Sun
Zones
4, 5, 6, 7
Water
Moderate, drought tolerant once established
Humidity
Average garden humidity
Lifespan
Perennial
Native To
North America
Toxicity
All parts are poisonous if ingested
The Story
Plant Bio
An upright, clump-forming herbaceous perennial with trifoliate, clover-like, blue-green leaves. Produces dense spikes of bright yellow, pea-like flowers in late spring. A tough, long-lived perennial native to the Rocky Mountains. It fixes nitrogen in the soil and can be slow to establish but is very low maintenance once it does.
Bloom Period:
Uses & Benefits:
Marketplace
Where to Buy
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Planting
How to Grow
- Tuck seeds into well-draining soil in early spring.
- Water regularly until established, then drought tolerant.
- Provide full sun for optimal flowering.
- Mulch to conserve moisture and suppress weeds.
- Divide clumps every 3-4 years in early spring.
- Prune after flowering to maintain shape.
Pro Tip
Sow seeds directly in the garden for best germination; they need light to germinate.
Keep It Thriving
Care Guide
Do
- Water young plants regularly 🌱
- Deadhead spent flowers to encourage more blooms
- Apply a balanced fertilizer in spring
Don't
- Avoid overwatering to prevent root rot ❌
- Don’t fertilize in late fall
- Don’t disturb roots during flowering
Seasonal Care Calendar
| Task | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Deadhead | ||||||||||||
| Divide | ||||||||||||
| Mulch | ||||||||||||
| Plant | ||||||||||||
| Prune |
Watch Out For
Pests & Diseases
Common Pests
Common Diseases
In the Garden
Landscape Uses & Companions
Landscape Uses
Companion Plants
Multiply
Propagation Methods
Good to Know
Common Questions
Mountain Goldenbanner questions
What zones can Mountain Goldenbanner grow in?
Mountain Goldenbanner is hardy in USDA Zones 4–7. Inside that range it survives winter in the ground; outside it, grow it as an annual or a container plant you protect.
Is Mountain Goldenbanner deer resistant?
Yes — Mountain Goldenbanner is rated deer-resistant. Deer typically pass it over, though extreme hunger can override any plant's defenses.
When does Mountain Goldenbanner bloom?
Mountain Goldenbanner typically blooms in late spring through late fall. Exact timing shifts a week or two with your zone — Sow's bloom calendar maps it to your garden.
Does Mountain Goldenbanner need full sun?
Mountain Goldenbanner does best in full sun to part shade. In hot climates, afternoon shade keeps blooms fresher longer.
Is Mountain Goldenbanner drought tolerant?
Yes — once established (usually after the first full season), Mountain Goldenbanner handles dry spells with minimal watering. Water deeply its first year to build the root system that makes that possible.
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Grow Mountain Goldenbanner with confidence
See it in a design of your actual yard, get zone-matched care reminders, and track it season by season in your garden journal.
