Threadleaf coreopsis (Coreopsis hybrid 'Route 66') Genus:  Coreopsis 'Route 66' features big, bold, bicolor blooms. A rich ring of burgundy surrounding the flower center bleeds out to the very tips of the yellow petals. Narrow, deep-green foliage forms vigorous, uniform clumps. Noteworthy Characteristics:  This new variety, discovered in Pennsylvania, has proven a reliable survivor through cold Pennsylvania winters. Care:  Easy. Grow in full sun. Keep moderately moist. Prefers fertile, well-drained soil. Can tolerate dry conditions once established. Cut back in late summer to encourage regrowth and rebloom. Propagation: 

Cutting or division. PPAF. Asexual propagation prohibited without license.

Problems: 

Watch for powdery mildew in humid conditions.

Information provided by Santa Rosa Gardens

Overview

Height 1 ft. to 3 ft. Spread 1 ft. to 3 ft. Growth Habit Clumps Growth Pace Fast Grower Light Full Sun to Part Shade Moisture Medium Moisture Maintenance Low Characteristics Showy Flowers Bloom Time Early Summer, Late Summer, Summer Flower Color Red, Yellow Uses Backyard, Beds and Borders, Combinations, Container, Edging, Front Yard, Garden Rooms, Low-Maintenance, Small Spaces, Sun, Texture Style Cottage Garden, Formal Garden, Meadow Garden Seasonal Interest Summer Interest Tolerance Drought Tolerant Type Perennials