Coreopsis

A cheerful golden daisy that blooms tirelessly from June to September, bringing sunny color to borders, meadows, and cutting gardens. Coreopsis is a North American prairie native that carries its large single flowers on wiry stems above a neat mound of finely divided foliage. Once established it is remarkably drought-tolerant and asks for little more than full sun and well-drained soil. Deadheading every few days keeps the blooms coming for months, and shearing tired plants by a third in midsummer triggers a strong late-summer encore. Butterflies and native bees visit constantly, and the sturdy stems hold up well in summer bouquets.

Start coreopsis seeds indoors six to eight weeks before the last frost, or sow directly outdoors once the soil has warmed in mid to late spring. Press the seeds lightly onto the surface of moist seed-starting mix and do not cover them, as light aids germination. Keep the tray at 20 to 24 degrees Celsius and expect sprouting in five to fourteen days. Prick seedlings out into individual cells when they carry two true leaves, and harden them off for a week before transplanting after the last frost. Early-blooming cultivars such as Early Sunrise flower the first year from an early indoor sowing; most other types bloom freely from their second season onward.

The Season Plate

Your Coreopsis Year

Composed for Zone 7 · typical seasons · frost passes Apr 2, returns Nov 1

Plant Coreopsis Feb – May, Sep, pick Jun – Sep. Check the planting methods below and set your climate to personalize these windows.

Planting windows

Feb – May, Sep

Start seeds indoors · Feb – Mar

Sow seeds outdoors · Apr – May

Plant young plants · Mar – Apr, Sep

Outdoor planting

Mar – May, Sep

follow the method shown for each window

First picking

around Apr 8

≈ 219 days from this planting

Composed for —ColdTemperateMildWarmNorthSouthUse my locationUsed once to set your season · only the zone is kept

Week-by-week Coreopsis reminders watering, feeding and pruning, timed to your dates

In the app

Frost alerts for your garden a warning before a cold night costs you the crop

In the app

Follow-up planting dates plan the next planting for the season

In the app

Subscribe free

Get my Coreopsis datesSaved to your free garden plan · no card needed

Plant coreopsis in spring after the last frost or in early fall at least six weeks before the ground freezes, choosing a spot in full sun with sharply drained soil. It thrives in average to lean ground and actually performs poorly in rich, heavily amended beds, where lush growth leads to floppy stems and few flowers. Space plants 35 to 45 cm apart so air can move freely through the clump. Water deeply at planting and keep the soil evenly moist through the first growing season while the root system establishes.

Once established, coreopsis needs supplemental water only during prolonged drought. The single most important maintenance task is deadheading: snip spent flowers back to the next lateral bud every few days to keep the plant producing new blooms from June into September. When flowering slows in midsummer and the clump begins to look ragged, shear the whole plant back by one third; fresh foliage and a generous flush of late-summer flowers follow within three to four weeks. Divide congested clumps every two to three years in early spring, because large-flowered coreopsis is naturally short-lived and regular division keeps the planting vigorous.

In autumn, cut the stems back after the first hard frost, or leave a few seed heads standing for finches and tidy up in early spring instead. Avoid piling heavy winter mulch directly over the crown, which invites rot in wet climates. Taller selections grown in rich soil or partial shade may sprawl and benefit from a discreet grow-through ring, though plants raised lean in full sun are usually self-supporting.

Coreopsis is a natural partner for other prairie perennials that share its love of sun and lean, well-drained soil. Combine it with coneflowers, black-eyed Susans, and salvias for a long-blooming pollinator border in gold, purple, and blue. Ornamental grasses such as little bluestem and prairie dropseed make an airy backdrop, while catmint and lavender echo its relaxed habit at the front of the bed. Avoid pairing coreopsis with plants that demand rich, moist soil or heavy feeding, because those conditions shorten its life.

The Society Table

Coneflower belongs beside it. Fennel doesn't.

Old growers' knowledge, checked against Coreopsis's real companion table below — test any plant you're growing.

Grows well in the company of · 3

ConeflowerBlack-eyed SusanSalvia

Keep apart · 1

Fennel

Plant Coreopsis with good neighboursThe planner flags conflicts before they're in the ground

Related growing guides

Flowers

Coneflower

A good companion for Coreopsis

Flowers

Black-eyed Susan

A good companion for Coreopsis

Flowers

Salvia

A good companion for Coreopsis

Flowers

Peony

View growing guide

Coreopsis performs best in average to lean, well-drained soil with a slightly acidic to neutral pH of 5.5 to 7.0. Sandy or gravelly ground suits it perfectly, and it tolerates poor soil that defeats fussier perennials. Heavy clay must be lightened with grit or coarse sand, or plants should go into raised beds, because winter wet is the surest way to lose coreopsis. Feeding should be minimal: a light top-dressing of compost in spring is plenty. Rich soil and high-nitrogen fertilizers push lush, floppy foliage at the expense of flowers and shorten the life of the clump.

Ideal Temperature

Hardiness Zone Compatibility

Cut coreopsis for fresh arrangements in the cool of early morning, choosing stems whose buds are just opening or flowers that opened within the past day. Use clean, sharp pruners and strip any foliage that would sit below the waterline. Stand the stems immediately in a bucket of cool water and let them condition in a cool, dark place for several hours before arranging. Coreopsis typically lasts five to seven days in a vase; recut the stems and refresh the water every two days to stretch the display. For seed saving, leave a few flower heads on the plant until the petals drop and the head is dry and dark, then clip it and shake the small flat brown seeds into a paper envelope.

Aphids

Pest

Clusters of small green, black, or gray insects on tender shoot tips and flower buds, often with sticky honeydew and distorted new growth.

Prevention Encourage ladybugs, lacewings, and hoverflies by planting a diverse flower border. Avoid high-nitrogen feeding, which produces the soft growth aphids prefer.

Fix: Knock colonies off with a sharp jet of water or pinch out infested tips. Spray persistent infestations with insecticidal soap, covering the undersides of leaves.

Slugs and Snails

Pest

Ragged holes chewed in young leaves and basal foliage, with silvery slime trails visible in the morning. Damage is worst on soft spring growth.

Prevention Keep the area around the crown free of dense mulch and boards where slugs shelter. Water in the morning so the soil surface dries by nightfall.

Fix: Hand-pick at dusk with a flashlight, set beer traps, or apply iron phosphate bait around plants. Copper barriers protect container-grown plants.

Powdery Mildew

Disease

White to gray powdery coating on leaves and stems, appearing mainly in late summer when days are warm, nights are cool, and humidity is high.

Prevention Space plants generously for good air circulation, grow in full sun, and water at the base rather than overhead. Divide congested clumps before they become dense.

Fix: Remove and discard heavily coated leaves. Spray with neem oil or a potassium bicarbonate solution at the first sign of infection. The disease is unsightly but rarely fatal.

Crown Rot

Disease

Plants wilt even though the soil is moist, the crown at soil level turns brown and mushy, and whole stems collapse. Worst in heavy, waterlogged ground, especially over winter.

Prevention Plant in sharply drained soil or raised beds, avoid overwatering, and keep mulch away from the crown. In wet-winter regions, add coarse grit to the planting hole.

Fix: There is no cure once the crown rots. Lift and discard affected plants, improve drainage in the spot, and replant elsewhere in the bed rather than in the same hole.

Spider Mites

Pest

Fine yellow stippling on the foliage, leaves turning bronze and dry, and delicate webbing on the undersides of leaves during hot, dry spells.

Prevention Keep plants adequately watered during heat waves and avoid dusty, drought-stressed conditions that favor mite outbreaks.

Fix: Spray foliage forcefully with water, especially the undersides, and repeat every few days. Release predatory mites or apply insecticidal soap for heavier infestations.

Troubleshooting Common Problems

The most common disappointment is a clump that dies out after two or three years; large-flowered coreopsis is naturally short-lived, so plan on dividing every two to three years or letting plants self-seed to keep the display going. Crown and root rot strike in heavy, wet soil, especially over winter. Floppy, sprawling stems usually mean too much shade, too much fertilizer, or skipped deadheading. In hot, humid summers powdery mildew can coat the foliage, though it rarely does lasting harm. Aphids occasionally cluster on buds and tender tips in spring but are easily washed off.

Growing Tips

1. Sow coreopsis seeds on the surface of the mix and do not cover them; they need light to germinate, and buried seeds often fail to sprout.
2. Grow coreopsis lean. Skip rich compost and heavy feeding, because plants on fertile soil flop, mildew more readily, and flower less than those on average ground.
3. Deadhead every few days at the height of summer, cutting each spent stem back to the next lateral bud instead of just snapping off the old flower head.
4. When bloom slows in midsummer, shear the whole clump back by one third. It looks drastic, but fresh foliage and a strong late-summer flush follow within a few weeks.
5. Treat large-flowered coreopsis as a short-lived perennial: divide clumps every two to three years in spring or let plants self-seed so the display never fades out.
6. Plant in early fall, around six weeks before the ground freezes, to give roots a cool, moist establishment period and a head start on next year's bloom.
7. Water to establish, then sparingly. Overwatering, and especially winter wet over the crown, kills far more coreopsis plants than drought ever does.
8. In wet-winter regions, plant on a slope, in a raised bed, or with a handful of grit under the crown so water never pools around the plant.
9. Leave some seed heads standing in autumn for goldfinches, and cut the clump back after frost rather than in fall if your winters are mild and wet.
10. Choose a first-year-flowering cultivar like Early Sunrise if you want golden daisies the same summer you sow the seed.