Campanula Species, Bellflower, Canterbury Bells

Campanulamedium

Family
Campanulaceae (kam-pan-yew-LAY-see-ee)
Genus
Campanula (kam-PAN-yoo-luh)
Species
medium (MEED-ee-um)
Synonym
Campanula bourdiniana
Campanula florida
Sun Exposure
Full Sun
Sun to Partial Shade
Foliage
Herbaceous
Height
24-36 in. (60-90 cm)
Spacing
12-15 in. (30-38 cm)
15-18 in. (38-45 cm)
18-24 in. (45-60 cm)
Hardiness
USDA Zone 2a: to -45.5 °C (-50 °F)
USDA Zone 2b: to -42.7 °C (-45 °F)
USDA Zone 3a: to -39.9 °C (-40 °F)
USDA Zone 3b: to -37.2 °C (-35 °F)
USDA Zone 4a: to -34.4 °C (-30 °F)
USDA Zone 4b: to -31.6 °C (-25 °F)
USDA Zone 5a: to -28.8 °C (-20 °F)
USDA Zone 5b: to -26.1 °C (-15 °F)
USDA Zone 6a: to -23.3 °C (-10 °F)
USDA Zone 6b: to -20.5 °C (-5 °F)
USDA Zone 7a: to -17.7 °C (0 °F)
USDA Zone 7b: to -14.9 °C (5 °F)
USDA Zone 8a: to -12.2 °C (10 °F)
USDA Zone 8b: to -9.4 °C (15 °F)
Bloom Color
Pink
Dark Blue
Bloom Time
Late Spring/Early Summer
Mid Summer
Other Details
Category
Biennials
Perennials
Water Requirements
Average Water Needs; Water regularly; do not overwater
Foliage Color
Where to Grow
Grow outdoors year-round in hardiness zone
Can be grown as an annual
Bloom Characteristics
Flowers are good for cutting
This plant is attractive to bees, butterflies and/or birds
Bloom Size
Other details
Soil pH requirements
6.1 to 6.5 (mildly acidic)
6.6 to 7.5 (neutral)
7.6 to 7.8 (mildly alkaline)
Patent Information
Non-patented
Propagation Methods
From seed; direct sow outdoors in fall
From seed; sow indoors before last frost
From seed; direct sow after last frost
Seed Collecting
Allow seedheads to dry on plants; remove and collect seeds
Regional

This plant is said to grow outdoors in the following regions:

Camarillo, California

Los Angeles, California

Paradise, California

Carbondale, Colorado

Clinton, Connecticut

Rathdrum, Idaho

Barbourville, Kentucky

Baltimore, Maryland

Grosse Ile, Michigan

Litchfield, New Hampshire

Mount Vision, New York

Sayville, New York

Geneva, Ohio

Lima, Ohio

Jones, Oklahoma

Molalla, Oregon

Wilkes Barre, Pennsylvania

Clarksville, Tennessee

Salt Lake City, Utah

ELK, Washington

Spokane, Washington

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Featured Videos

Gardener's Notes:

7
positives
1
neutral
1
negative
Sort By:
Sort By:
A
Calgary, AB (Zone 3b) | June 2015 | neutral

Campanula medium does not "spread" at all - it is tap-rooted. As a biennial, it regenerates itself from seed, formed in it's second year...Read More

E
Mount Vision, NY | August 2012 | positive

With regard to the negative comment above, you evidently got the type of plant that spreads aggressively. Not all Canterbury Bells sprea...Read More

T
Rathdrum, ID (Zone 5b) | August 2012 | positive

The campanula that I have has a double bloom in sky blue. It blooms profusely, but does need deadheading to keep those blooms coming. Thi...Read More

J
Litchfield, NH (Zone 5b) | June 2012 | negative

I have these planted in full sun (like 10+ hours of direct sun w/o shade) in irrigated flower beds alongside my veg garden. I found thes...Read More

A
A
Camarillo, CA | May 2011 | positive

New flower buds often form right at the base of the first flowers. So if you snip off each spent bloom individually more blooms will deve...Read More

K
K
Baltimore, MD (Zone 7b) | May 2011 | positive

My favorite plant! After several yrs of trying, my best results were to scatter seeds in garden around July or Aug, separate about 6" a...Read More

G
(Zone 5a) | June 2006 | positive

Large, beautiful bell shaped flowers. It does not have the "saucer" like some Cup and Saucer flowers do. Takes a fair amount of shade.<...Read More

S
Baldwin Park, CA (Zone 9a) | June 2003 | positive

I was amazed to see how long the flowers lasted out in the Southern California sun. I waited 10 days for more flowers to bloom before I t...Read More

E
E
(Zone 4b) | January 2003 | positive

Very pretty biennial plant, I grew mine from seeds. It bloomed twice and produced big pods which had seeds I think, but they had dropped ...Read More

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