Getting it to bloom

Why won't my Campanula poscharskyana bloom? (and how to make it flower)

Also called Serbian bellflower, trailing bellflower (Campanula poscharskyana).

More about campanula poscharskyana

About Campanula poscharskyana

Campanula poscharskyana · also called Serbian bellflower, trailing bellflower · flowering

Campanula poscharskyana is a vigorous, trailing perennial covered in lavender-blue, star-shaped flowers from late spring through summer. It tumbles freely over walls, banks and containers and self-seeds into paving cracks. More spreading and faster than wall bellflower, it tolerates dry shade, poor soil and neglect, making it superb low-maintenance groundcover.

Plant type: flowering

Watch for — Over-vigorous spread: Runners and self-seeding can colonise paving and beds. Shear after flowering and pull unwanted seedlings to keep it in bounds.

The reasons campanula poscharskyana isn't blooming

Almost every non-blooming campanula poscharskyana traces back to one of these, roughly in order of how common they are:

Too little sun — most of these need full sun (or very bright light) to flower well; shade gives leaves, not blooms.
Too much nitrogen feed, driving lush foliage at the expense of flowers (very common with general or lawn feeds).
The plant has not been deadheaded, so it stops flowering once it sets seed.
Irregular watering — drought or waterlogging at the budding stage makes buds abort.
It is still too young or was checked by a transplant and is rebuilding before flowering.

Feeding campanula poscharskyana a high-nitrogen general feed and growing it in too little sun — you get a big leafy plant and almost no flowers.

The fix — how to get campanula poscharskyana to flower

Maximise sun. Give campanula poscharskyana the sunniest spot you have — for most bedding and fruiting plants, more direct light directly means more flowers.
Switch the feed. Move off high-nitrogen feeds and use a higher-potassium "bloom" or tomato-type feed as it comes into flower.
Deadhead regularly. Remove spent flowers often to keep it producing more rather than stopping to set seed.
Water consistently. Keep moisture even through budding and flowering — drought-then-flood swings make buds drop.

Light and feeding do most of the heavy lifting here. Dial in the spot with the light guide for campanula poscharskyana and get the feeding right with the campanula poscharskyana fertilising schedule — the wrong feed (too much nitrogen) is one of the most common silent reasons a healthy plant makes leaves instead of flowers.

Bloom season and what to expect

Campanula poscharskyana flowers across its growing season (mostly summer) and, kept fed and deadheaded, can bloom for many weeks or right up to frost.

Post-bloom care so it flowers again

Deadhead, keep feeding lightly, and many will rebloom; collect seed from the best plants at the end of the season if you want to grow them again.

For everything else this plant needs day to day, see the full campanula poscharskyana care brief and its watering schedule — a stressed, badly watered plant rarely has the energy to flower at all.

Campanula poscharskyana blooming — frequently asked questions

Why won't my campanula poscharskyana flower?

Campanula poscharskyana blooms on the season's growth given enough sun, warmth and the right feed — there is no cold or photoperiod trick, just good growing conditions and a bloom-leaning feed. The most common reason it is not happening: Too little sun — most of these need full sun (or very bright light) to flower well; shade gives leaves, not blooms.

How do I make campanula poscharskyana bloom?

Give campanula poscharskyana the sunniest spot you have — for most bedding and fruiting plants, more direct light directly means more flowers. Move off high-nitrogen feeds and use a higher-potassium "bloom" or tomato-type feed as it comes into flower.

When does campanula poscharskyana normally bloom?