Threadleaf Coreopsis 'Butter Rum' (Coreopsis verticillata) brings a soft, airy texture to your garden with its fine, threadlike foliage and a long season of cheerful yellow daisy flowers. This cultivar is part of the Permathread series and is prized for steady bloom and a tidy, mounded look that fits easily into smaller beds and mixed plantings.

At maturity, expect plants around 15-18 inches tall with a spread of about 20-24 inches. Give it a spot in full sun for the strongest flowering, but it will also grow in part shade (you may see a more open habit and fewer blooms with less light). It is hardy in USDA Zones 3-9.

Plant in well-drained soil and water regularly during establishment. Once rooted in, it tolerates heat and periods of drought better than many summer bloomers, making it a dependable choice for low-fuss areas. Avoid consistently wet or soggy sites, which can lead to flopping and weaker growth.

To keep the display going, remove spent flowers when practical, or shear plants back lightly after a flush of bloom to refresh foliage and encourage additional flowering. If clumps become crowded or spread beyond their space, divide every few years to maintain vigor.

Use this coreopsis to brighten borders and pollinator plantings. The flowers provide nectar and pollen for bees and butterflies, and seedheads can feed songbirds later on. Pair it with other sun-loving perennials and ornamental grasses to highlight its fine texture and golden color.

Specifications

• Cold hardiness zone: 3-9 (-40 degrees F) - Contact your local extension to confirm hardiness if you are in a fringe zone (we cannot guarantee hardiness in fringe zones)
• Light: Full sun   Part sun
• Mature height: 15-18"
• Spread: 20-24"
• Tolerant of: Deer, Drought, Rabbits
• Attracts: Birds, Butterflies
• Good for borders & edging: Yes
• Native to the U.S.: Yes

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