North America Native Plant

Oblong Bluecurls

Botanical name: Trichostema oblongum

USDA symbol: TROB

Life cycle: annual

Habit: forb

Native status: Native to Canada âš˜ Native to the lower 48 states  

Oblong Bluecurls: A Charming Native Annual for Western Gardens If you’re looking to add some native charm to your western garden while supporting local pollinators, oblong bluecurls (Trichostema oblongum) might just be the perfect little wildflower you’ve been searching for. This delightful annual herb brings a touch of wild beauty ...

Oblong Bluecurls: A Charming Native Annual for Western Gardens

If you’re looking to add some native charm to your western garden while supporting local pollinators, oblong bluecurls (Trichostema oblongum) might just be the perfect little wildflower you’ve been searching for. This delightful annual herb brings a touch of wild beauty to any landscape with its distinctive curved flowers and easy-going nature.

What Makes Oblong Bluecurls Special?

Oblong bluecurls is a native annual forb that belongs to the mint family, though don’t expect it to take over your garden like some of its more aggressive cousins. This well-behaved plant stays compact and produces charming small flowers that range from blue to purple, each adorned with distinctive curved stamens that extend beyond the petals—hence the bluecurls name that makes perfect sense once you see them up close.

As an annual, this plant completes its entire life cycle in one growing season, but don’t let that discourage you. Oblong bluecurls has a wonderful habit of self-seeding, meaning you’ll likely enjoy its presence year after year with minimal effort on your part.

Where Does It Call Home?

This native beauty is right at home across the Pacific Northwest and parts of western North America. You’ll find oblong bluecurls growing naturally in British Columbia, California, Idaho, Oregon, and Washington. It’s adapted to the diverse climates and conditions of these regions, from coastal areas to inland valleys.

Why Your Garden (and Local Wildlife) Will Love It

Oblong bluecurls might be small, but it packs a big punch when it comes to supporting local ecosystems. The nectar-rich flowers are magnets for native bees, butterflies, and other beneficial pollinators. Since it’s a true native species, it has co-evolved with local wildlife and provides exactly the kind of food sources these creatures have depended on for thousands of years.

From a design perspective, oblong bluecurls works wonderfully as:

  • A groundcover in naturalized areas
  • An accent plant in wildflower gardens
  • A charming addition to xeriscapes and drought-tolerant landscapes
  • Part of a native plant pollinator garden
  • A delicate filler in rock gardens

Growing Oblong Bluecurls Successfully

One of the best things about oblong bluecurls is how low-maintenance it can be once you understand its preferences. This plant thrives in conditions that might challenge other garden favorites, making it perfect for water-wise gardening.

Ideal Growing Conditions

  • Sunlight: Full sun to partial shade
  • Soil: Well-draining soils, including sandy or rocky conditions
  • Water: Drought-tolerant once established; avoid overwatering
  • Climate: Hardy in USDA zones 6-10

Planting and Care Tips

Getting oblong bluecurls established in your garden is refreshingly straightforward:

  • Timing: Direct seed in fall or early spring for best results
  • Soil prep: Ensure good drainage—this plant doesn’t appreciate soggy feet
  • Watering: Water gently during germination, then reduce frequency as plants establish
  • Maintenance: Minimal care needed; let plants go to seed for natural reseeding
  • Fertilizing: Generally unnecessary; too much fertility can actually reduce flowering

Is Oblong Bluecurls Right for Your Garden?

This native annual is an excellent choice if you’re looking to create a more sustainable, wildlife-friendly landscape. It’s particularly well-suited for gardeners who want to reduce water usage while still enjoying colorful blooms. The fact that it self-seeds means you’ll get the joy of discovering new plants each year, often in spots where they look most natural.

However, if you’re looking for a plant that will provide constant, showy color throughout the entire growing season, oblong bluecurls might not be your best choice. Its beauty is more subtle and seasonal, fitting perfectly into naturalized settings but perhaps not meeting the needs of formal flower beds.

For western gardeners committed to native plant gardening and supporting local ecosystems, oblong bluecurls offers an authentic piece of the regional landscape that’s both beautiful and beneficial. Plus, there’s something deeply satisfying about growing plants that truly belong in your corner of the world.

Oblong 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 oblongum Benth. - oblong bluecurls

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