The primary propagation methods for carum include seed sowing and division. Key factors for successful propagation encompass maintaining moderate light exposure, consistent temperatures around 15-21°C (59-70°F), and well-draining soil with a neutral to slightly alkaline pH. Special considerations involve ensuring seeds are fresh, as germination rates diminish with age, and divisions are best taken in early spring or autumn. The general difficulty level is moderate with challenges such as long germination times and the need for patient cultivation. Steps for propagation: 1) Sow seeds in early spring on the surface of moist, well-draining seed compost. 2) Provide constant moderate light and maintain soil temperature around 18°C (64°F). 3) Transplant seedlings when large enough to handle. For division, 4) carefully separate mature plants during dormancy, and 5) replant divisions promptly, ensuring they are appropriately watered.