North America Native Plant

Narrowleaf Bluecurls

Botanical name: Trichostema setaceum

USDA symbol: TRSE5

Life cycle: annual

Habit: forb

Native status: Native to the lower 48 states  

Synonyms: Trichostema dichotomum L. var. lineare (Walter) Pursh (TRDIL)  âš˜  Trichostema lineare Walter (TRLI5)   

Narrowleaf Bluecurls: A Rare Native Gem for Your Wild Garden If you’re looking to add a touch of wild beauty to your garden while supporting native ecosystems, narrowleaf bluecurls (Trichostema setaceum) might just be the perfect choice. This charming annual herb brings delicate purple-blue blooms and a lovely fragrance to ...

Rare plant alert!

Region: New Jersey

Status: Highlands Listed, S2: New Jersey Highlands region ⚘ 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) ⚘

Narrowleaf Bluecurls: A Rare Native Gem for Your Wild Garden

If you’re looking to add a touch of wild beauty to your garden while supporting native ecosystems, narrowleaf bluecurls (Trichostema setaceum) might just be the perfect choice. This charming annual herb brings delicate purple-blue blooms and a lovely fragrance to naturalized spaces, all while providing valuable resources for pollinators.

What Makes Narrowleaf Bluecurls Special?

Narrowleaf bluecurls is a native annual forb that belongs to the mint family, though it lacks the typical square stems of its cousins. What it does have are distinctive curved flower clusters that curl like tiny blue spirals – hence the bluecurls name. The narrow leaves and aromatic foliage add to its appeal, making it a delightful discovery for anyone exploring a wild garden or natural area.

You might also see this plant listed under its older scientific names, including Trichostema lineare or Trichostema dichotomum var. lineare, but Trichostema setaceum is the currently accepted name.

Where Does It Grow Naturally?

This native beauty has quite an impressive range across the eastern and southeastern United States. You’ll find narrowleaf bluecurls growing naturally in Alabama, Connecticut, Delaware, District of Columbia, Florida, Georgia, Indiana, Kentucky, Louisiana, Maryland, Mississippi, Missouri, New Jersey, New York, North Carolina, Ohio, Pennsylvania, South Carolina, Tennessee, Texas, Virginia, and West Virginia.

A Word About Rarity

Here’s something important to know: narrowleaf bluecurls is considered rare in some areas. In New Jersey, for example, it has a rarity status of S2, meaning it’s quite uncommon in the state. If you’re interested in growing this plant, please make sure you source seeds or plants responsibly from reputable native plant nurseries rather than collecting from wild populations.

Why Grow Narrowleaf Bluecurls?

There are several compelling reasons to include this native annual in your landscape:

  • Pollinator magnet: The small but numerous flowers attract bees, butterflies, and other beneficial insects
  • Low maintenance: Once established, it’s quite drought tolerant and needs minimal care
  • Natural beauty: Perfect for wildflower meadows, naturalized areas, and informal garden spaces
  • Self-seeding: Being an annual, it will readily reseed itself in suitable conditions
  • Native ecosystem support: Supports local wildlife and maintains genetic diversity

Growing Conditions and Care

Narrowleaf bluecurls thrives in USDA hardiness zones 5-9, making it suitable for most of the eastern United States. Here’s what this adaptable native prefers:

  • Sunlight: Full sun exposure for best flowering
  • Soil: Well-drained sandy or rocky soils; avoid heavy clay or constantly moist conditions
  • Water: Drought tolerant once established; avoid overwatering
  • pH: Adaptable to various soil pH levels

Planting and Care Tips

Growing narrowleaf bluecurls is refreshingly straightforward:

  • Direct seed in fall or early spring when soil temperatures are cool
  • Scatter seeds on prepared soil surface and lightly rake in
  • Keep soil moist until germination, then reduce watering
  • Thin seedlings if they become overcrowded
  • Allow plants to go to seed for natural reseeding
  • No fertilization needed – these plants prefer lean soils

Perfect Garden Companions

Narrowleaf bluecurls works beautifully in:

  • Wildflower meadows and prairies
  • Rock gardens and xerophytic landscapes
  • Naturalized areas and woodland edges
  • Pollinator gardens and butterfly gardens
  • Native plant collections

The Bottom Line

Narrowleaf bluecurls offers gardeners a chance to grow a truly special native plant that supports local ecosystems while adding unique beauty to informal landscapes. Its rarity makes it even more precious, so if you choose to grow it, you’ll be helping preserve this lovely species for future generations. Just remember to source your seeds responsibly, give it the well-drained conditions it loves, and enjoy watching the pollinators discover this hidden gem in your garden.

Whether you’re creating a wildflower meadow or simply want to add more native diversity to your landscape, narrowleaf bluecurls proves that sometimes the most rewarding plants are the ones that ask for very little while giving so much in return.

Narrowleaf Bluecurls

Classification

Group

Dicot

Kingdom

Plantae - Plants

Subkingdom

Tracheobionta - Vascular plants

Superdivision

Spermatophyta - Seed plants

Division

Magnoliophyta - Flowering plants

Subdivision
Class

Magnoliopsida - Dicotyledons

Subclass

Asteridae

Order

Lamiales

Family

Lamiaceae Martinov - Mint family

Genus

Trichostema L. - bluecurls

Species

Trichostema setaceum Houtt. - narrowleaf bluecurls

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