Getting it to bloom

Why won't my Bachelor's button bloom? (and how to make it flower)

Also called Bachelor's button, Cornflower, Bluebottle, Ragged robin (Centaurea cyanus).

More about bachelor's button

About Bachelor's button

Centaurea cyanus · also called Bachelor's button, Cornflower · flowering

Bachelor's button is a cheerful annual wildflower that thrives in full sun and well-drained soil. It is highly drought-tolerant once established, resists cold snaps, and self-seeds readily. Deadhead regularly to extend bloom from late spring through summer. Excellent for cutting gardens, meadow plantings, and attracting pollinators.

Plant type: flowering

Watch for — Failure to flower: Caused by insufficient sun or overly rich soil. Move to a sunnier spot and avoid high-nitrogen feeds. Plants sown in autumn and overwintered flower earlier and more prolifically.

The reasons bachelor's button isn't blooming

Almost every non-blooming bachelor's button 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 bachelor's button 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 bachelor's button to flower

Maximise sun. Give bachelor's button 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 bachelor's button and get the feeding right with the bachelor's button 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

Bachelor's button 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 bachelor's button care brief and its watering schedule — a stressed, badly watered plant rarely has the energy to flower at all.

Bachelor's button blooming — frequently asked questions

Why won't my bachelor's button flower?

Bachelor's button 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 bachelor's button bloom?

Give bachelor's button 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 bachelor's button normally bloom?