• Photo of Ceanothus thyrsiflorus (Ceanothus thyrsifloruss)

Plant Profile: Ceanothus thyrsiflorus

Taxonomy: Ceanothus thyrsiflorus

Names

Blueblossom, Blue Blossom

  • Photo of Ceanothus thyrsiflorus (Ceanothus thyrsifloruss)

Phonetic Spelling:see-a-NO-thus thurs-i-FLO-rus

Genus:Ceanothus

Species:thyrsiflorus

Family:Rhamnaceae

The blue blossom is a low-maintenance broadleaf evergreen shrub belonging to the buckthorn family (Rhamnaceae). Its striking blue flowers are a rarity that many gardeners seek. This shrub is ideal for creating screens and background plantings in expansive areas and on inclines. The evergreen foliage remains intact throughout the year, while the blue flowers drop individually, easily carried away by even the gentlest breeze.

**Seasons of Interest:**
- **Bloom:** Spring, from mid-May to mid-June

**Play Value:**
- Acts as a windbreak and buffer; enhances wildlife habitats.

**Wildlife Value:**
- The flowers attract hummingbirds, honeybees, and bumblebees, while the dense foliage offers excellent shelter for songbirds.

**Note:** It may be susceptible to freezing in harsher winters.

Ceanothus thyrsiflorus Feature Summary

Ceanothus thyrsiflorus Image Gallery

Tags

#hummingbirds
#evergreen
#showy flowers
#wildlife plant
#honey bees
#nectar plant
#cover plant
#slopes
#playground
#food source
#children's garden
#edible fruits
#bee friendly

Similar Plants

Ceanothus thyrsiflorus Feature Summary

Attributes
This plant was used as soap and for ceremonial wreaths by Native Americans.
SW. Oregon to Mexico
The flowers attract butterflies and the seeds are a food source for birds and small mammals.
Edible fruit
Wildlife Food Source
Attracts Pollinators
Attractive Flowers
Fruit
Fruit about 3 mm, glandular-sticky, slightly lobed.
Brown/Copper
Purple/Lavender
Flowers
7.5 cm spike-like clusters. Just before buds open they are pinky-lavender. Fruit about 3 mm, glandular-sticky, slightly lobed.
White
Blue
1-3 inches
Leaves
three prominent veins on the underside, tip obtuse to acute, margin sometimes gland-toothed.
3-6 inches
Whole Plant Traits
Cultural Conditions
Full sun (6 or more hours of direct sunlight a day)
Partial Shade (Direct sunlight only part of the day, 2-6 hours)
Alkaline (>8.0)
Good Drainage
Moist
Occasionally Dry
5b
5a
6a
6b
7a
7b
8b
8a
9a
9b
Landscape
Edible Garden
Butterfly Garden
Children's Garden
Recreational Play Area
Butterflies
Songbirds
Small Mammals
Hummingbirds

Ceanothus thyrsiflorus Attributes

Ceanothus thyrsiflorus: Uses (Ethnobotany)

This plant was used as soap and for ceremonial wreaths by Native Americans.

Ceanothus thyrsiflorus: Country Or Region Of Origin

SW. Oregon to Mexico

Ceanothus thyrsiflorus: Wildlife Value

The flowers attract butterflies and the seeds are a food source for birds and small mammals.

Ceanothus thyrsiflorus: Play Value

Attractive Flowers
Attracts Pollinators
Buffer
Colorful
Defines Paths
Easy to Grow
Edible fruit
Fragrance
Pieces Used in Games
Screening
Shade
Sound
Textural
Wildlife Cover/Habitat
Wildlife Food Source
Wildlife Larval Host
Wildlife Nesting
Wind Break
Wind Shimmer

Ceanothus thyrsiflorus Fruit

Ceanothus thyrsiflorus: Fruit Description

Fruit about 3 mm, glandular-sticky, slightly lobed.

Ceanothus thyrsiflorus: Fruit Type

Achene
Aggregate
Berry
Capsule
Caryopsis
Drupe
Follicle
Legume
Nut
Pome
Samara
Schizocarp
Siliqua

Ceanothus thyrsiflorus: Fruit Color

grass
Brown/Copper
grass
Purple/Lavender

Ceanothus thyrsiflorus: Fruit Value To Gardener

Edible
Fragrant
Good Cut
Good Dried
Long Bloom Season
Long-lasting
Showy

Ceanothus thyrsiflorus: Display/Harvest Time

Fall
Spring
Summer
Winter

Ceanothus thyrsiflorus: Fruit Length

< 1 inch
1-3 inches
> 3 inches

Ceanothus thyrsiflorus Flowers

Ceanothus thyrsiflorus: Flower Description

7.5 cm spike-like clusters. Just before buds open they are pinky-lavender. Fruit about 3 mm, glandular-sticky, slightly lobed.

Ceanothus thyrsiflorus: Flower Color

filter_vintage
Blue
filter_vintage
White

Ceanothus thyrsiflorus: Flower Bloom Time

Winter
Spring
Summer
Fall

Ceanothus thyrsiflorus: Flower Size

1-3 inches
3-6 inches
< 1 inch
> 6 inches

Ceanothus thyrsiflorus Leaves

Ceanothus thyrsiflorus: Leaf Description

three prominent veins on the underside, tip obtuse to acute, margin sometimes gland-toothed.

Ceanothus thyrsiflorus: Woody Plant Leaf Characteristics

Broadleaf Evergreen
Deciduous
Needled Evergreen
Semi-evergreen

Ceanothus thyrsiflorus: Leaf Color

spa
Green

Ceanothus thyrsiflorus: Leaf Type

Compound (Pinnately , Bipinnately, Palmately)
Fronds
Needles
Sheath
Simple

Ceanothus thyrsiflorus: Leaf Arrangement

Alternate
Opposite
Other/more complex
Rosulate
Whorled

Ceanothus thyrsiflorus: Hairs Present

No
Yes

Ceanothus thyrsiflorus: Leaf Length

< 1 inch
1-3 inches
3-6 inches
> 6 inches

Ceanothus thyrsiflorus: Leaf Feel

Fleshy
Glossy
Leathery
Papery
Prickly
Rough
Rubbery
Slippery
Smooth
Soft
Velvety
Waxy

Ceanothus thyrsiflorus Whole Plant Traits

Ceanothus thyrsiflorus: Plant Type

Annual
Bulb
Carnivorous
Edible
Epiphyte
Fern
Ground Cover
Herb
Herbaceous Perennial
Houseplant
Mushroom
Native Plant
Ornamental Grasses and Sedges
Perennial
Poisonous
Rose
Shrub
Succulent
Tree
Turfgrass
Vegetable
Vine
Water Plant
Weed
Wildflower

Ceanothus thyrsiflorus: Woody Plant Leaf Characteristics

Broadleaf Evergreen
Deciduous
Needled Evergreen
Semi-evergreen

Ceanothus thyrsiflorus: Habit/Form

Arching
Ascending
Broad
Cascading
Climbing
Clumping
Columnar
Conical
Creeping
Dense
Erect
Horizontal
Irregular
Mounding
Multi-stemmed
Multi-trunked
Open
Oval
Prostrate
Pyramidal
Rounded
Spreading
Vase
Weeping

Ceanothus thyrsiflorus: Growth Rate

Slow
Medium
Rapid

Ceanothus thyrsiflorus: Texture

Fine
Medium
Coarse

Ceanothus thyrsiflorus Cultural Conditions

Ceanothus thyrsiflorus: Light

Dappled Sunlight (Shade through upper canopy all day)
Deep shade (Less than 2 hours to no direct sunlight)
Full sun (6 or more hours of direct sunlight a day)
Partial Shade (Direct sunlight only part of the day, 2-6 hours)

Ceanothus thyrsiflorus: Soil pH

Acid (<6.0)
Alkaline (>8.0)
Neutral (6.0-8.0)

Ceanothus thyrsiflorus: Soil Drainage

Frequent Standing Water
Good Drainage
Moist
Occasional Flooding
Occasionally Dry
Occasionally Wet
Very Dry

Ceanothus thyrsiflorus: USDA Plant Hardiness Zone

thermostat
5a
thermostat
5b
thermostat
6a
thermostat
6b
thermostat
7a
thermostat
7b
thermostat
8a
thermostat
8b
thermostat
9a
thermostat
9b

Ceanothus thyrsiflorus Stem

Ceanothus thyrsiflorus: Stem Is Aromatic

No
Yes

Ceanothus thyrsiflorus Landscape

Ceanothus thyrsiflorus: Landscape Theme

Asian Garden
Butterfly Garden
Children's Garden
Cottage Garden
Cutting Garden
Drought Tolerant Garden
Edible Garden
English Garden
Fairy Garden
Garden for the Blind
Native Garden
Nighttime Garden
Pollinator Garden
Rain Garden
Rock Garden
Shade Garden
Water Garden
Winter Garden

Ceanothus thyrsiflorus: Landscape Location

Coastal
Container
Hanging Baskets
Houseplants
Lawn
Meadow
Naturalized Area
Near Septic
Patio
Pond
Pool/Hardscape
Recreational Play Area
Riparian
Rock Wall
Slope/Bank
Small Space
Vertical Spaces
Walkways
Woodland

Ceanothus thyrsiflorus: Attracts

Bats
Bees
Butterflies
Frogs
Hummingbirds
Moths
Pollinators
Predatory Insects
Reptiles
Small Mammals
Songbirds
Specialized Bees

Ceanothus thyrsiflorus Bark

Ceanothus thyrsiflorus: Surface/Attachment

Bumpy
Exfoliating
Fissured
Furrowed
Lenticels
Papery
Patchy
Peeling
Ridges
Scaly
Shaggy
Shiny
Shredding
Smooth
Spongy