North America Native Plant

Torrey’s Blazingstar

Botanical name: Mentzelia torreyi var. acerosa

USDA symbol: METOA

Life cycle: biennial

Habit: forb

Native status: Native to the lower 48 states  

Torrey’s Blazingstar: A Rare Native Gem for Western Gardens If you’re looking to add a touch of wild western charm to your garden, Torrey’s blazingstar (Mentzelia torreyi var. acerosa) might just be the hidden treasure you’ve been searching for. This remarkable biennial forb brings something truly special to native plant ...

Rare plant alert!

Region: Conservation status by state

Status: S4T3: 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. ⚘ Apparently Secure: Uncommon but not rare, and usually widespread. Possibly cause for longterm concern. Typically more than 100 occurrences in the state or more than 10,000 individuals ⚘

Torrey’s Blazingstar: A Rare Native Gem for Western Gardens

If you’re looking to add a touch of wild western charm to your garden, Torrey’s blazingstar (Mentzelia torreyi var. acerosa) might just be the hidden treasure you’ve been searching for. This remarkable biennial forb brings something truly special to native plant gardens with its stunning evening display of golden, star-shaped blooms that seem to light up the twilight hours.

A True Western Native

Torrey’s blazingstar is a proud native of the American West, specifically calling Idaho home. As a plant that’s perfectly adapted to the challenging conditions of western landscapes, it represents the resilient beauty of our native flora. However, there’s something important every gardener should know about this species.

Important Conservation Note

Before you fall completely in love with this plant (and trust us, you will), it’s crucial to understand that Torrey’s blazingstar has a global conservation status of S4T3, indicating it has some conservation concerns. This means if you choose to grow this beauty, you should only source it from reputable native plant nurseries that practice responsible propagation. Never collect seeds or plants from wild populations.

Why Choose Torrey’s Blazingstar?

This isn’t your typical garden flower, and that’s exactly what makes it so appealing:

  • Evening Magic: The large, papery yellow flowers open in the evening, creating a spectacular nighttime display
  • Pollinator Paradise: Night-flying moths, beetles, and other nocturnal pollinators absolutely adore these blooms
  • Drought Champion: Once established, this plant thrives with minimal water
  • Native Heritage: Supporting local ecosystems and wildlife
  • Unique Texture: The distinctive forb structure adds interesting texture variation to plantings

Perfect Garden Settings

Torrey’s blazingstar isn’t meant for every garden, but it absolutely shines in the right setting:

  • Native plant and wildflower gardens
  • Xeriscaping and drought-tolerant landscapes
  • Rock gardens and naturalized areas
  • Evening or moon gardens
  • Pollinator-focused plantings

Growing Torrey’s Blazingstar Successfully

As a biennial, this plant has a two-year life cycle, spending its first year developing roots and foliage, then blooming magnificently in its second year before setting seed. Here’s how to give it the best chance to thrive:

Ideal Growing Conditions

  • Sunlight: Full sun is absolutely essential
  • Soil: Well-draining sandy or rocky soils work best
  • Water: Drought tolerant once established; avoid overwatering
  • Climate: Adapted to USDA zones 4-8

Planting and Care Tips

  • Seeding: Direct seed in fall for best results
  • Spacing: Give plants room to develop their natural form
  • Watering: Water sparingly; this plant prefers lean conditions
  • Maintenance: Minimal care needed once established
  • Patience: Remember it’s biennial – you’ll see blooms in the second year

Is Torrey’s Blazingstar Right for Your Garden?

This plant is perfect for gardeners who appreciate native flora, want to support nocturnal pollinators, and don’t mind waiting for the spectacular second-year bloom show. It’s ideal if you’re creating a low-maintenance, drought-tolerant landscape that celebrates regional plant heritage.

However, it might not be the best choice if you prefer plants with immediate gratification, need year-round foliage, or garden in very humid conditions where well-draining soil is hard to achieve.

A Responsible Choice

By choosing to grow Torrey’s blazingstar with responsibly sourced material, you’re not just adding beauty to your garden – you’re participating in conservation efforts and helping maintain genetic diversity of this special native plant. It’s a small but meaningful way to support our native plant heritage for future generations.

Ready to add some western wildness to your garden? Seek out reputable native plant sources and get ready for an evening display that will have you planning your garden around sunset viewing!

Torrey’s Blazingstar

Classification

Group

Dicot

Kingdom

Plantae - Plants

Subkingdom

Tracheobionta - Vascular plants

Superdivision

Spermatophyta - Seed plants

Division

Magnoliophyta - Flowering plants

Subdivision
Class

Magnoliopsida - Dicotyledons

Subclass

Dilleniidae

Order

Violales

Family

Loasaceae Juss. - Loasa family

Genus

Mentzelia L. - blazingstar

Species

Mentzelia torreyi A. Gray - Torrey's blazingstar

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