Perennial.ˇ This is an old fashioned, single bloom favorite. The deep, chocolate-brown ? almost black flowers grow on slender stems and are sure to impress. Reseeds itself year after year. Latin Name: Alcea rosea Online Code: 141438 Product Weight: 100 seeds Plant Type: Perennial Hardiness Zone: 2 to 9 Bloom Color: Deep maroon Grows Best In: Full Sun Bloom Period: July to September Days to Seed Germination: 10 to 14 days Seed Planting Depth: 3 mm (1/8") Seed Spacing: 1.3 cm (1/2") Plant Spread: 30 cm (12") Growing Height: 120-180 cm (48-72") Planting Instructions: Start indoors 6 to 8 weeks before the last frost.