25 Seeds Double Blackberry Hollyhock Perennial Flower

Double Blackberry Hollyhock produces sumptuous, fully double blossoms in a deep, velvety shade that approaches black. These towering perennials create a dramatic focal point in the garden, attracting bees, butterflies, and hummingbirds with their nectar-rich blooms. Ideal for cottage gardens, they bring old-fashioned charm and vertical elegance.

Use this hollyhock at the back of borders, along fences, or as a standalone accent. The double flowers are excellent for cutting, adding a luxurious touch to arrangements. Plants thrive in full sun and well-drained soil, often blooming in their second year. Stake in windy locations to protect tall stems, and deadhead spent blooms to encourage additional flowering.

Species: Alcea rosea
Variety: Double Blackberry
Type: Short-lived perennial (often biennial)
Plant_Habit: Upright, 5-6 feet
Sun: Full sun
Soil: Well-drained, fertile
Days_to_Harvest: Not applicable
Zones: 3-8
Germination: 10-14 days at 65-75°F
Sowing: Direct sow after last frost or start indoors 6-8 weeks before last frost
Spacing: 18-24 inches
Notes: Double flowers rarely produce seeds; blooms second year, sometimes first if started early.