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Campanula, or bellflower plants, are perennial flowers with cheerful nodding heads.
Bellflowers thrive in cool, temperate climates, which is why they’re native to so many places around the world.
Bellflowers are at their peak blooming in June and July, but they can continue to bloom into the fall in some areas.
Grow campanula bellflowers for long-lasting alpine native flowers that will brighten the landscape in rock gardens and border areas.
More than 300 species of Campanula exist, ranging in size and color from annuals to perennials.
Colors include pink, white, lavender, and light blue for the upturned, open cup-shaped flowers, which are the primary distinguishing feature.
The lower-growing varieties, in particular, are excellent for ground cover because they spread slowly over time.
Bellflowers typically start blooming in July and continue to do so until the first frost.
Conditions for Growing Bellflowers
However, bellflowers are best suited to USDA plant hardiness zones 4 and up, although some protection is required for them to thrive even in the zone.
Their cold-tolerant nature makes them valuable specimens in regions with harsh winter conditions.
For the best flower production, they need full sun and well-drained soil with moderate moisture in a sunny location.
Bellflowers can withstand periods of drought once they are established. Bellflowers can be grown in soil with any pH level, even highly acidic.
How to Grow Campanula Bellflowers
Rhizomes or seeds can be used to start Campanula’s growth. In the spring, after all, the danger of frost has passed, sow the tiny seeds in prepared soil.
When taking care of bellflowers, make sure to keep the seedlings moist but not soggy.
Rhizomes are planted by cutting them from the parent plant and burying their roots in the soil.
You don’t need to be an expert to care for bellflowers. Most perennials can withstand a wide range of climates, including drought and extreme heat.
Deadheading is an important part of bellflower maintenance if you want to see more blooms and have a more impressive display.
The plant can also be rejuvenated by chopping it down to the ground in the fall and winter.
Bellflower seed heads should be removed to prevent the spread of invasive varieties.
Varieties of Bellflower Plants
There are many types of bellflowers. Some of the most common include:
- Bluebells Campanulas, including bluebells, are quite common in gardens. These tiny woodland flowers can be found in highland fields all over North America.
- Scotch bluebell is native to the British Isles and may get 10 inches (25.5 cm.) tall.
- Dwarf bellflowers Dwarf bellflower is useful in container gardens and tucked into rockery crevasses. It gets only 3 inches (7.5 cm.) tall but may spread 15 inches (38 cm.) wide.
- Carpathian harebell Carpathian harebells may achieve 12 inches (30.5 cm.) and are one of the most cold-hardy specimens.
- American bellflower The 1-inch (2.5 cm) wide, true-blue flowers of the American bellflower are worth the extra effort to keep it under control.
Is Campanula an Annual or a Perennial?
Campanula can be annual, biennial, or perennial depending on the species.
Large and round bell-shaped flowers are produced in the second year of growth by the Campanula medium, also known as Canterbury Bells. These flowers are fantastic when they’ve been trimmed.
Heirloom-loving Campanula, also known as the “harebell,” thrives in the perennial garden. This appears to be the species that showed up in our garden, based on its appearance.
Another herbaceous perennial used in floral arrangements is Campanula latifolia.
If you live in a temperate climate, Campanula can thrive.
Even in extremely cold climates, herbaceous perennial plants are able to survive the winters. New growth springs up again in spring after the plants die back in the fall and winter.
HOW TO GROW CAMPANULA FROM SEED
There are a number of ways to grow campanula from seed.
This can be done by:
- Starting the seeds indoors 8 to 10 weeks before the last spring frost
- Planting directly in the garden, or
- Winter sowing in milk jugs
PLANTING CAMPANULA SEEDS OUTDOORS
- Campanula seeds can also be planted directly into a prepared garden bed.
- To do this, sprinkle the seeds directly onto the garden bed surface in late fall.
- Allow natural stratification during the winter months, and the following spring the new seedlings will begin to emerge.
- Planting the seeds using this method avoids any root disruption, as the seedlings will not need to be disturbed after they have rooted.
HOW FAST DOES CAMPANULA GROW?
Perennial Campanula can take several years before they reach blooming size, as with most herbaceous perennials.
Biennial campanula will flower the following year from planting.
HOW LONG DOES CAMPANULA BLOOM?
Perennial Campanula has its bloom time, and like other perennials will generally bloom for shorter periods rather than all summer long.
It will then return to the garden year after year, blooming at around the same time every year.
Our campanula blooms for about two to three weeks in a large flush in early summer.
It can have occasional blooms throughout the summer following the main flowering period.