Gloriosa Daisy (Rudbeckia gloriosa) is an open-pollinated tender perennial that produces huge 6 to 8" blooms in deep orange, yellow, and red. A cultivar of native North American Rudbeckia, it offers an exceptional cut flower with a vase life of up to two weeks. This seed pack covers roughly 10 square feet. At a glance Variety: Gloriosa Daisy (Rudbeckia gloriosa) Type: Tender perennial, open-pollinated, non-GMO Days to germinate: 7-14 days Sun: Full sun to light shade Spacing: Thin to 12" to 15" apart Planting depth: 1/16" Height at maturity: 24" to 30" Hardiness: USDA Zones 3-10 Approx. seeds per pack: 425 (covers about 10 sq ft) Best for Bold color in beds and borders Cut-flower beds with long-lasting blooms Pollinator gardens for bees and butterflies Tougher sites, including rocky soil Gardeners wanting big, showy flowers How to grow Sow in fall or spring at 1/16" deep, using about 125 seeds per square foot. Germination takes 7-14 days. Thin to 12" to 15" apart. Grow in full sun to light shade with moderate water; plants tolerate rocky soil. Expect 24" to 30" plants that bloom from summer into fall. About Grow Organic Grow Organic offers seeds and natural growing supplies for productive, pollinator-friendly gardens, helping growers support native habitat with earth-friendly methods.