Getting it to bloom

Why won't my Plains Coreopsis bloom? (and how to make it flower)

Also called Plains Coreopsis, Golden Tickseed, Calliopsis, Annual Coreopsis (Coreopsis tinctoria).

More about plains coreopsis

About Plains Coreopsis

Coreopsis tinctoria · also called Plains Coreopsis, Golden Tickseed · flowering

Plains Coreopsis is a fast-growing annual wildflower native to the central US, bearing bright yellow-and-red bicolored daisy-like blooms from summer into fall. Extremely drought-tolerant once established, it thrives in poor soils and full sun, self-sows prolifically, and is a magnet for bees, butterflies, and goldfinches.

Plant type: flowering

Watch for — Aphids: Soft-bodied aphids cluster on new growth and flower buds, causing distortion. Knock off with a strong water jet or apply insecticidal soap. Beneficial insects such as ladybirds usually keep populations in check.

The reasons plains coreopsis isn't blooming

Almost every non-blooming plains coreopsis 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 plains coreopsis 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 plains coreopsis to flower

Maximise sun. Give plains coreopsis 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 plains coreopsis and get the feeding right with the plains coreopsis 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

Plains Coreopsis 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 plains coreopsis care brief and its watering schedule — a stressed, badly watered plant rarely has the energy to flower at all.

Plains Coreopsis blooming — frequently asked questions

Why won't my plains coreopsis flower?

Plains Coreopsis 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 plains coreopsis bloom?

Give plains coreopsis 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 plains coreopsis normally bloom?