North America Native Plant

Largeflower Triteleia

Botanical name: Triteleia grandiflora

USDA symbol: TRGR7

Life cycle: perennial

Habit: forb

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

Largeflower Triteleia: A Native Western Gem for Your Garden If you’re looking to add some authentic Western charm to your garden while supporting local ecosystems, largeflower triteleia (Triteleia grandiflora) might just be the perfect addition. This delightful native perennial brings beautiful blue blooms and effortless elegance to gardens across much ...

Largeflower Triteleia: A Native Western Gem for Your Garden

If you’re looking to add some authentic Western charm to your garden while supporting local ecosystems, largeflower triteleia (Triteleia grandiflora) might just be the perfect addition. This delightful native perennial brings beautiful blue blooms and effortless elegance to gardens across much of western North America.

What Makes Largeflower Triteleia Special?

Largeflower triteleia is a native perennial that grows as what botanists call a forb – essentially a non-woody flowering plant that dies back each winter and returns fresh each spring. Don’t let the technical term fool you though; this plant is all about simple, natural beauty.

Standing about 2 feet tall when mature, this charming plant produces clusters of striking blue flowers that really steal the show in mid-spring. The grass-like green foliage provides a nice backdrop without competing for attention, and the whole plant has a graceful, upright growth form that fits beautifully into naturalized settings.

Where Does It Call Home?

This native beauty has quite an impressive range! You’ll find largeflower triteleia growing naturally across the western United States and into Canada. It’s native to British Columbia, California, Colorado, Idaho, Montana, Oregon, Utah, Washington, and Wyoming – making it a true child of the American West.

Why Your Garden (and Local Wildlife) Will Love It

There are several compelling reasons to consider adding largeflower triteleia to your landscape:

  • Native plant benefits: As a native species, it supports local ecosystems and requires fewer resources than non-native alternatives
  • Pollinator magnet: Those beautiful blue flowers aren’t just pretty – they’re packed with nectar that attracts bees, butterflies, and other beneficial pollinators
  • Low maintenance: Once established, this plant is quite drought tolerant and doesn’t need constant fussing
  • Versatile design element: Perfect for wildflower gardens, rock gardens, naturalized areas, or mixed perennial borders
  • Seasonal interest: Provides lovely spring color when many other plants are just waking up

Perfect Growing Conditions

Largeflower triteleia is surprisingly adaptable, but it does have some preferences. Here’s what makes it happiest:

  • Soil: Well-draining, medium-textured soil works best (avoid heavy clay or very sandy soils)
  • pH: Slightly acidic to neutral soil (pH 6.0-7.5) is ideal
  • Water: Moderate water needs – about 20-40 inches of precipitation annually
  • Sun exposure: Full sun to partial shade (intermediate shade tolerance)
  • Climate: Hardy in USDA zones 4-8, tolerating temperatures down to -33°F

Growing and Care Tips

The good news is that largeflower triteleia is relatively easy to grow once you understand its needs:

Planting: This plant grows from bulbs, which should be planted in fall for spring blooms. You can also propagate using bare root divisions. Plant bulbs about 8 inches deep to match the plant’s minimum root depth.

Spacing: Plan for about 2,700-4,800 plants per acre if you’re naturalizing a large area, or simply space individual bulbs 6-8 inches apart in garden settings.

Watering: While it has medium drought tolerance, regular watering during the growing season (spring and summer) will give you the best results. Once established, it becomes quite self-sufficient.

Maintenance: This is a low-maintenance plant with a moderate growth rate. Allow the foliage to die back naturally after blooming – the plant needs this time to store energy in its bulbs for next year’s show.

A Few Things to Keep in Mind

Largeflower triteleia does have a relatively short lifespan compared to some perennials, and it doesn’t spread aggressively (which is actually a good thing for garden design!). The plant isn’t fire resistant, so consider this if you’re in a fire-prone area. Also, while it’s moderately cold hardy, it does need at least 160 frost-free days to complete its growing cycle.

One potential challenge is availability – commercial sources can be limited, so you might need to seek out specialty native plant nurseries or participate in seed exchanges with other gardeners.

The Bottom Line

Largeflower triteleia offers an excellent way to incorporate authentic regional character into your garden while supporting native pollinators and local ecosystems. Its beautiful blue spring flowers, low-maintenance nature, and native credentials make it a wonderful choice for gardeners looking to create more sustainable, ecologically valuable landscapes. Just remember to be patient – like many native bulbs, it may take a season or two to really establish and show its full potential.

How

Largeflower Triteleia

Grows

Growing season

Spring and Summer

Lifespan

Short

Growth form & shape

Bunch and Erect

Growth rate

Moderate

Height at 20 years
Maximum height

2.0

Foliage color

Green

Summer foliage density

Porous

Winter foliage density

Porous

Foliage retention

No

Flowering

Yes

Flower color

Blue

Fruit/seeds

No

Fruit/seed color

Brown

Allelopath

No

Nitrogen fixing

None

Toxic

None

C:N Ratio

Medium

Fire Resistant

No

Foliage Texture

Fine

Low-growing Grass

No

Resproutability

No

Coppice Ability

No

Bloat

None

Largeflower Triteleia

Growing Conditions

Adapted to Coarse Soil

No

Adapted to Medium Soil

Yes

Adapted to Fine Soil

No

Anaerobic tolerance

Medium

CaCO₃ tolerance

Low

Cold Stratification

No

Drought tolerance

Medium

Nutrient requirement

Medium

Fire tolerance

Medium

Frost-free days minimum

160

Hedge tolerance

None

Moisture requirement

Medium

pH range

6.0 to 7.5

Plants per acre

2700 to 4800

Precipitation range (in)

20 to 40

Min root depth (in)

8

Salt tolerance

None

Shade tolerance

Intermediate

Min temperature (F)

-33

Cultivating

Largeflower Triteleia

Flowering season

Mid Spring

Commercial availability

No Known Source

Fruit/seed abundance

Medium

Fruit/seed season

Spring to Spring

Fruit/seed persistence

No

Propagated by bare root

Yes

Propagated by bulb

Yes

Propagated by container

No

Propagated by corm

No

Propagated by cuttings

No

Propagated by seed

No

Propagated by sod

No

Propagated by sprigs

No

Propagated by tubers

No

Seed per pound
Seed spread rate

None

Seedling vigor
Small grain

No

Vegetative spread rate

None

Largeflower Triteleia

Classification

Group

Monocot

Kingdom

Plantae - Plants

Subkingdom

Tracheobionta - Vascular plants

Superdivision

Spermatophyta - Seed plants

Division

Magnoliophyta - Flowering plants

Subdivision
Class

Liliopsida - Monocotyledons

Subclass

Liliidae

Order

Liliales

Family

Liliaceae Juss. - Lily family

Genus

Triteleia Douglas ex Lindl. - triteleia

Species

Triteleia grandiflora Lindl. - largeflower triteleia

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