Campanula poscharskyana 'Blue Waterfall'

Blue Waterfall Bellflower

An attractive trailing groundcover perennial with a vigorous spreading habit, Blue Waterfall produces masses of star-shaped, violet-blue flowers (often with small white throats) along cascading stems over a mound of small bright green foliage. Blooms begin in late spring and continue through summer into early fall, creating color that delights in beds, borders, containers, or spilling over walls.


Plant Characteristics


Type: Herbaceous perennial, trailing groundcover



Mature Height: ~6–10 in (15–25 cm)



Mature Spread: ~18–24 in (45–60 cm) or more



Flower Color: Violet-blue star-shaped blossoms (with sometimes white centers)



Foliage Color: Bright green




Growing Conditions


USDA Hardiness Zones: ~3–9 (varies by source but generally cold hardy)



Light: Full sun to partial shade (morning sun with afternoon shade beneficial in hot climates)



Soil: Prefers moist, well-drained soil; tolerates a range of soil types if drainage is good



Water: Moderate — keep evenly moist but not water-logged



Maintenance: Low to moderate — cut back spent flowers to encourage rebloom; divide clumps occasionally for vigor




Landscape Uses
This cultivar works beautifully in :



Rock gardens and slopes where it cascades over stones



Borders or paths as a low, spreading filler



Containers and hanging baskets for cascading color



Edging and groundcover to add long-season blue tones



It’s also attractive to hummingbirds and pollinators and generally deer resistant.


Care Tips


Deadheading: Remove spent blooms to encourage prolonged flowering.



Division: Divide every few years in spring or fall to maintain health and spread.



Heat Strategy: In very hot climates, provide some afternoon shade and mulch to protect roots.




At a Glance


Bloom time: Late spring → summer, often into early fall



Habit: Trailing, cascading, and vigorous groundcover



Uses: Rock gardens, groundcover, containers, borders 

Plant type

Perennial

Height

18"-24"

Width

10'-12"

Hardiness zones

3–7

Sunlight

Full Sun, Partial Shade

Growth rate

Moderate

Bloom time

Early Summer, Late Spring, Summer

Flower color

Blue

Leaf color

Green

Fall color

Green

Attracts

Butterflies

Soil

Moist well-drained

Landscape use

Container, Groundcover

Shape

Clump, Compact, Ground Cover

Drought tolerant

No