Tall Coreopsis

Year-round

Tall coreopsis is a big, easygoing native perennial that belongs at the back of the bed, not the front, and it earns its keep with bumblebees and native bees in late summer.

• This species is native to most of Arkansas, including the Ouachita Mountains region around Hot Springs, though it does not naturally occur in the low-lying Mississippi Alluvial Plain or the Gulf coastal plain further south and east.
• Give it full sun, six or more hours a day, though it tolerates a half day of shade.
• It is not picky about soil. Clay, loam or sand all work as long as drainage is decent.
• Mature height runs 5 to 8 feet, occasionally taller, so plant it at the back of a bed or along a fence line where the height reads as a backdrop rather than a wall blocking the front yard.
• It spreads by underground rhizomes and can form a loose colony over a few seasons. Give it room, or plan on dividing it every few years to keep it where you want it.
• Bright yellow blooms with a dark purple-red center show up in late summer into fall, and small native bees, bumblebees and wasps visit for nectar and pollen.

Fall

Bloom carries into fall, seed heads feed birds if you leave them standing, and fall is a good time to divide an overgrown clump before dormancy.

• Blooming often continues into fall as nights start to cool, tapering off once temperatures drop consistently toward frost.
• Ripening seed heads feed goldfinches and other birds into fall, which is why many gardeners leave the dried stalks standing rather than cutting back right after bloom.
• If a tidy, front-facing look matters more than the birds this season, cut stems back to a few inches once flowering finishes and the foliage browns.
• Fall, while the plant is heading into dormancy, is also a good time to dig and divide an overgrown clump or remove rhizomes that have spread past where you want them.

Cutting the spent stalks down to a low, even edge in fall gives a visible bed a tidier, HOA-friendly look than leaving tall dead stems standing all winter, if that matters more to you than the birds.

Winter

This plant is fully winter hardy in Hot Springs, dies back completely above ground, and needs nothing from you until spring except an optional cleanup cut.

• Tall coreopsis is winter hardy across USDA zones 4 through 8, and Hot Springs sits in zone 8a, so a typical winter here is well within what this plant handles without any protection.
• All above-ground growth dies back to the ground after a hard frost. The plant survives winter as a rhizome mat and caudex below the soil surface.
• No watering is needed during dormancy under normal Arkansas winter rainfall.
• If stalks were left up for winter interest or bird food, this is the last stretch to enjoy that look. Cutting the clump down to a few inches any time before new growth starts in spring is fine either way.

A clump of tall, bare winter stalks can read as unkept from the street. Cutting it back to a few inches by late winter gives a clean, HOA-friendly reset before spring growth starts, if you did not already cut back in fall.

Spring

Spring is establishment season. New shoots push up from last year's rhizome mat, and this is also the best window to plant a new one or rein in a spreading colony.

• New growth emerges from the rhizome base as the soil warms in spring. Hot Springs sits in USDA zone 8a, so expect green-up well ahead of areas further north.
• If you are planting a new one, spring after the last hard frost is the best window. Keep the root zone evenly moist for the first few weeks while it settles in.
• Skip the fertilizer. Rich soil just makes an already-tall plant more likely to flop later in the season.
• This is a good time to walk the bed and pull or dig out any new shoots coming up outside where you want the colony, since the rhizomes travel underground and can show up a foot or two from the original planting.

Summer

Established plants shrug off Arkansas summer heat with little watering, buds form through midsummer, and the tall stems may need a little support once flowers open.

• Established plants are drought tolerant and rarely need extra water once summer heat and humidity settle in. A deep soak during a long dry stretch helps keep blooms coming.
• A first-year plant, or one recently divided, still needs regular water through the hot months while its roots establish.
• Flower buds build through midsummer, and the yellow, purple-red-centered blooms typically open from around late July into fall.
• In open or windy spots, or in rich soil, the tall stems can lean. A single plant may need a stake, but a cluster of three or more usually holds itself up by leaning together.
• Deadheading is optional. It will not push out a lot of extra bloom on this species, but pinching off spent flower heads keeps a bed that faces the street looking tended.

Deadheading spent blooms through summer keeps a front-facing planting looking cared for, which reads as more HOA-conscious than letting the whole colony go to seed at once.