Hardy Hibiscus flower
8240 - Hardy Hibiscus are vigorously growing, herbaceous, perennial flowering shrubs. They are hardy in zones 4 through 9. The flowers of the hardy hibiscus come in shades of pink, white, lavender and red and can grow 6 to 10 inches in width. Nick the hard seed coat at the wider, rounded end of the seed with a clean craft knife. Soak the seeds in a small bowl of hot water for up to 24 hours. Start seeds 12 weeks before your last expected spring frost.