Photo by Melody

PlantFiles: Yellow Bellflower
Campanula thyrsoides

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Family: Campanulaceae (kam-pan-yew-LAY-see-ee) (Info)
Genus: Campanula (kam-PAN-yoo-luh) (Info)
Species: thyrsoides (thurs-OY-deez) (Info)

4 members have or want this plant for trade.

Category:
Biennials

Height:
18-24 in. (45-60 cm)

Spacing:
6-9 in. (15-22 cm)

Hardiness:
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)

Sun Exposure:
Full Sun
Sun to Partial Shade

Danger:
Unknown - Tell us

Bloom Color:
Pale Yellow
White/Near White

Bloom Time:
Mid Summer
Late Summer/Early Fall

Foliage:
Herbaceous

Other details:
Drought-tolerant; suitable for xeriscaping

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:
Unknown - Tell us

Propagation Methods:
From seed; winter sow in vented containers, coldframe or unheated greenhouse
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

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Profile:

1 positive
No neutrals
No negatives

Gardeners' Notes:

RatingAuthorContent
Positive wetdogfarm On Oct 31, 2007, wetdogfarm from Eveleth, MN (Zone 3a) wrote:

I have successfully grown this campanula since 1987 in zone 3a. It makes a very low rosette in the first year, then sends up one (usually) spike in early summer the 2nd year. It is a good reseeder, since it is biennial I let it go to seed, however the flower stalk gets downright ugly as it matures and dries to brown. Despite this, I look forward to the flowers each year which are not really yellow, but a greenish-yellow cream. I keep plants spaced at least one foot apart to get bigger flower spikes.

Regional...

This plant has been said to grow in the following regions:

Eveleth, Minnesota
Mount Hood Parkdale, Oregon
Portland, Oregon



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