Alcea rosea, commonly known as hollyhock, is a biennial or short-lived perennial native to southwestern China and Turkey. Easily grown from seed, seeds germinate in 10-21 days at 60-70°F and require light for successful germination. This classic cottage garden plant produces tall spikes of colorful flowers and is hardy in USDA zones 2-10.
Before sowing
No pre-treatment needed — sow directly.
Sowing
What to expect
Tips
Sow indoors 6-8 weeks before the last frost date for first-year blooms, or direct sow in late August-September for blooms the following year. Press seeds lightly into soil without burying them, as they need light to germinate. Maintain consistent moisture but avoid waterlogging. For improved germination, apply cold stratification by keeping seeds at 35-40°F for 10 days before warming to 65-70°F. Space plants 18-24 inches apart for good air circulation to prevent rust fungus. Plants develop long taproots, so use deep pots when starting indoors.
Sources: Select Seeds, Outside Pride, Everwilde Farms, PFAF, Plants For A Future, North Carolina Extension, West Coast Seeds, Flower People, Missouri Botanical Garden, Greenhouse Management
