Coreopsis grandiflora 'Sunray' – Double Yellow Flowers All Summer

Coreopsis 'Sunray' (Coreopsis grandiflora 'Sunray')

Coreopsis grandiflora 'Sunray' (kor-ee-OP-sis gran-dih-FLOOR-ah) has double to semi-double yellow flowers that begin blooming in late spring and continue throughout the summer. The species is native to the central and southeastern U.S. Flowers are good for cutting. Use in beds, borders, or containers.

Noteworthy Characteristics

• Double, deep yellow flowers the whole summer
• Usually grown as an annual

Growing Conditions & Care

Grow in full sun or partial shade and fertile, well-drained soil. Deadhead regularly, although birds are attracted to the seedheads.

Propagation

Start seeds at 55° to 61° F in winter.

Potential Problems

Slugs, snails, rust, bacterial spot, Botrytis flower blight, aster yellows, powdery and downy mildews, fungal spots.

Quick Reference

• Height/Spread: 1–3 ft.
• Light: Full sun to part shade
• Moisture: Medium
• Maintenance: Moderate
• Bloom Time: Late spring to late summer
• Flower Color: Yellow
• Uses: Beds, borders, cut flower, suitable as annual
• Type: Perennial