Getting it to bloom

Why won't my Corn Marigold bloom? (and how to make it flower)

Also called Corn Marigold, Corn Chrysanthemum, Field Marigold (Glebionis segetum).

More about corn marigold

About Corn Marigold

Glebionis segetum · also called Corn Marigold, Corn Chrysanthemum · flowering

Corn marigold is a hardy annual native to the eastern Mediterranean and long naturalised in Britain as an arable weed of cornfields and disturbed ground, prized for its vivid golden-yellow, daisy-like flowers that bloom from June through October. It thrives in well-drained, slightly acidic to neutral, poor soils in full sun and is intolerant of lime; the single most important care fact is to avoid alkaline or clay soils, which inhibit growth. It is an outstanding pollinator plant beloved by bees and hoverflies. Chrysanthemum genus species — including corn marigold — are listed by the ASPCA as toxic to cats, dogs, and horses.

Plant type: flowering

Watch for — Grey mould (Botrytis cinerea): Prolonged wet weather causes fluffy grey mould on stems and flowers; thin plants for air circulation, remove dead flower heads promptly, and avoid overhead watering.

The reasons corn marigold isn't blooming

Almost every non-blooming corn marigold 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 corn marigold 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 corn marigold to flower

Maximise sun. Give corn marigold 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 corn marigold and get the feeding right with the corn marigold 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

Corn Marigold 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 corn marigold care brief and its watering schedule — a stressed, badly watered plant rarely has the energy to flower at all.

Corn Marigold blooming — frequently asked questions

Why won't my corn marigold flower?

Corn Marigold 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 corn marigold bloom?

Give corn marigold 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 corn marigold normally bloom?