Primary propagation methods for woad include seed sowing and possibly root cuttings. Seeds require stratification to enhance germination. Key factors for success include well-draining soil, full sun to partial shade, and moderate watering. In colder climates, start indoor seeding early as woad endures a biennial growth cycle. Generally, propagation is moderately difficult due to germination variability. Steps: 1) Stratify seeds by placing them in moist sand within a refrigerator for 2 weeks. 2) Sow stratified seeds in well-draining soil in a sunny location, barely covering them with soil. 3) Keep soil moist but not waterlogged until germination, which takes around 1-2 weeks. 4) Once established, thin seedlings to prevent overcrowding. 5) Transplant outdoors after the last frost date, spacing plants 8 inches apart.