Getting it to bloom

Why won't my Bellflower Codonopsis bloom? (and how to make it flower)

Also called Bellflower codonopsis, Vinca-flowered codonopsis, Twining bellflower (Codonopsis vinciflora).

More about bellflower codonopsis

About Bellflower Codonopsis

Codonopsis vinciflora · also called Bellflower codonopsis, Vinca-flowered codonopsis · flowering

Codonopsis vinciflora is a slender, twining herbaceous perennial native to the mountain woodlands of China and the eastern Himalayas, producing small, sky-blue to lavender bellflowers in summer on scrambling stems that can clamber through nearby shrubs or a light support. It grows from a fleshy taproot and dies back completely each winter, re-emerging in late spring. Give it a sheltered, partially shaded position in humus-rich, well-drained soil and avoid disturbing the deep root. Toxicity to pets is not fully characterised; treat as mildly toxic and keep pets away.

Plant type: flowering

The reasons bellflower codonopsis isn't blooming

Almost every non-blooming bellflower codonopsis 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 bellflower codonopsis 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 bellflower codonopsis to flower

Maximise sun. Give bellflower codonopsis 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 bellflower codonopsis and get the feeding right with the bellflower codonopsis 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

Bellflower Codonopsis 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 bellflower codonopsis care brief and its watering schedule — a stressed, badly watered plant rarely has the energy to flower at all.

Bellflower Codonopsis blooming — frequently asked questions

Why won't my bellflower codonopsis flower?

Bellflower Codonopsis 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 bellflower codonopsis bloom?

Give bellflower codonopsis 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 bellflower codonopsis normally bloom?