Coreopsis ‘Sienna Sunset’

Coreopsis 'Sienna Sunset' is commonly called Sienna Sunset tickseed. It is a herbaceous perennial cultivar in the daisy family, Asteraceae.

Coreopsis 'Sienna Sunset' grows best in full sun, ideally with at least 6 hours of direct sunlight daily. Some light afternoon shade may be tolerated, but too little light can reduce flowering and promote flopping.

Water Coreopsis 'Sienna Sunset' when the soil has begun to dry, providing low to moderate moisture rather than keeping it constantly wet. Established plants tolerate short dry periods, but newly planted specimens need more regular watering.

Coreopsis 'Sienna Sunset' typically grows about 16–20 inches tall and 20–24 inches wide. Size can vary with soil fertility, moisture, climate, and winter survival.

Yes, Coreopsis 'Sienna Sunset' is a herbaceous perennial. Its foliage and stems may die back in winter before regrowing from the crown in spring.

Coreopsis 'Sienna Sunset' is generally listed for USDA Zones 5–9. Winter survival can be less reliable in exposed or wet sites, and some evaluations found it short-lived in colder climates.

Plant Coreopsis 'Sienna Sunset' in well-drained sandy or loamy soil. It tolerates rocky, shallow, and relatively dry ground better than heavy, poorly drained soil.

Coreopsis 'Sienna Sunset' can grow in clay if drainage is improved and the site does not remain waterlogged. Amend the planting area or place the plant in a raised or sloped location when heavy clay drains poorly.

Yes, established Coreopsis 'Sienna Sunset' has good drought tolerance once its root system is established. Water it during prolonged heat or drought, especially during its first growing season.

Coreopsis 'Sienna Sunset' tolerates heat and some humidity, but hot, humid conditions with heavy summer rain can cause stems to sprawl and may increase powdery mildew risk. Good air circulation and well-drained soil help.

Yes, Coreopsis 'Sienna Sunset' can be grown in a container. Use a pot with drainage holes and a fast-draining potting mix, and expect to water more often than plants growing in the ground.

Coreopsis 'Sienna Sunset' is generally considered deer resistant, although no plant is completely deer-proof. Deer pressure, local food availability, and browsing habits can affect results.

Coreopsis 'Sienna Sunset' may flop because of excessive moisture, rich soil, heavy summer rain, insufficient light, or natural post-bloom regrowth. Shearing sprawling stems in midsummer and avoiding overfertilization can improve its habit.

Yes, deadheading Coreopsis 'Sienna Sunset' removes spent flowers and can encourage additional blooming. Cut flower stems back to a healthy leaf joint or trim the plant after the first major flush.

Cut back Coreopsis 'Sienna Sunset' in midsummer if it becomes untidy or sprawls, which may encourage a fall rebloom. Remove dead stems and foliage in late fall or early spring, depending on whether you want to provide winter habitat.

Coreopsis 'Sienna Sunset' usually needs little fertilizer when grown in average soil. Excess fertility can produce weak, floppy growth, so use only a light feeding if growth is poor or the soil is notably infertile.

Powdery mildew is a notable problem for Coreopsis 'Sienna Sunset', and crown rot can occur in wet, poorly drained soil. Improve air circulation, water at the base, and avoid saturated conditions.

Reduce powdery mildew by improving air circulation, thinning crowded growth, and watering the soil rather than the foliage. Remove badly affected leaves and consider a labeled fungicide if the disease is severe.

Plant Coreopsis 'Sienna Sunset' in spring after the soil can be worked or in early fall several weeks before the ground freezes. Spring planting is preferable in colder areas where winter survival is uncertain.

Space Coreopsis 'Sienna Sunset' about 18–24 inches apart to allow for its mature spread and provide air circulation. Use closer spacing only when a quicker, denser planting is desired.

Set the plant with its crown at the same level it occupied in the nursery pot, backfill with well-drained soil, and water thoroughly. Keep the soil lightly and evenly moist while the plant establishes, but do not leave it saturated.

Yes, Coreopsis 'Sienna Sunset' is well suited to rock gardens, dry borders, sidewalk edges, and other sites with well-drained or shallow rocky soil. Full sun is important for compact growth and abundant flowers.

Propagate Coreopsis 'Sienna Sunset' primarily by division in spring or by basal root cuttings. Because this is a named cultivar, seed may not produce plants that match the parent.

Yes, divide Coreopsis 'Sienna Sunset' in spring as new growth begins. Lift the clump, separate healthy rooted sections, and replant them promptly in well-drained soil.

Coreopsis 'Sienna Sunset' can spread gradually by rhizomes and may broaden into a clump over time. It is not generally considered aggressively invasive, but division may be useful if it outgrows its space.

Coreopsis 'Sienna Sunset' is considered non-toxic to dogs and cats. Pets may still experience mild digestive upset after eating large amounts of any unfamiliar plant material.

No cultivar-specific human toxicity evidence was found for Coreopsis 'Sienna Sunset'. Even so, avoid eating ornamental plants and contact a medical professional or poison-control service if ingestion causes symptoms.

Coreopsis 'Sienna Sunset' generally blooms from June into September, with timing varying by region and weather. Cutting it back after the first flush can encourage later-season flowers.

The flowers open in burnt sienna, peach, or warm apricot shades and gradually fade lighter toward orange, salmon, or yellow-orange. Individual flowers typically have a contrasting yellow center.

The daisy-like flowers of Coreopsis 'Sienna Sunset' are typically about 1½ inches across. Their warm, changing coloration is one of the cultivar’s main ornamental features.

Yes, Coreopsis 'Sienna Sunset' attracts butterflies and other pollinators. Its open daisy-shaped flowers provide accessible nectar during the summer bloom period.

Coreopsis 'Sienna Sunset' can produce a later flush of flowers after deadheading or midsummer shearing. Rebloom is more likely when the plant receives full sun and is not stressed by drought or excessive moisture.