Tall Coreopsis is a summer-into-fall bloomer that reaches 4 to 8 feet tall, making it one of the most dramatic flowers for the back of a sunny border. Hardy from zones 3 to 3, this native wildflower relative thrives on neglect once established, asking only for full sun and well-drained soil. The plant flowers continuously from June through November, rewarding gardeners with weeks of golden blooms that butterflies and bees visit eagerly. It's drought-tolerant and deer-proof, a combination that makes it feel almost too easy to grow.
Full Sun
Low
3-3
96in H x 24in W
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High
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Rising to a towering 4 to 8 feet tall, Tall Coreopsis dominates the late-season garden with an extended bloom window from summer deep into fall. The plant shrugs off drought, completely ignores deer pressure, and asks for virtually nothing once its roots are established beyond full sun and occasional deadheading. Its height and prolific flowering make it a natural choice for anchoring the back layer of borders or creating a vertical screen of continuous color.
Tall Coreopsis serves as a cut flower and garden focal point, valued for its ability to add height and season-long color to arrangements and landscape designs. The flowers attract pollinators throughout the growing season, making it a functional addition to gardens designed to support bees and butterflies.
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Start seeds indoors in pots 6 to 8 weeks before your last spring frost. Keep the soil temperature between 60 and 70°F. A period of moist cold stratification improves germination rates: mix seeds with damp sand or vermiculite, seal in a bag, and refrigerate at 35 to 40°F for 30 to 60 days. Check frequently for sprouting seedlings and transplant them individually as they emerge. This chilling period mimics the plant's natural winter dormancy and primes seeds for faster germination.
Transplant seedlings outdoors after your last frost date when soil has warmed. Harden off seedlings gradually over 7 to 10 days by increasing their exposure to sun and wind. Space plants 2 inches apart.
Deadhead spent flowers regularly to encourage continuous blooming throughout the season and maintain a tidy appearance. Cut or pinch back stems in early summer to promote bushier growth and more numerous flowers.
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