Gray-headed ConeflowerCommon Name: Gray-headed Coneflower Scientific Name: Ratibida pinnata USDA Hardiness Zones: 3 to 9 Approximate number of seeds per gram (ounce) : 1,050 (30,000) Sun: full sun or partial shade Water: keep soil moist during germination, average to dry conditions once established Soil: plant up to 1/8 inch deep, grows in most soils from sandy to clay. Temperature: 20 to 24 degrees Celsius (68 to 75 degrees Fahrenheit) Spacing: 5 pound per acre, will grow in expanding clumps each year. Germination Time: 20 to 30 days The gray-headed coneflower is more closely related to mexican hat than to most other coneflowers. It germinates best if direct sown in the autumn. If planting in the spring, cold stratification is necessary for 6 to 8 weeks. When planting, keep in mind that gray-headed coneflowers grow tall and will reach heights of 3 to 6 feet. Blooms in mid-summer, but does not typically bloom from seed the first year.
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