The primary propagation method for zea is by seed sowing. Key factors for successful germination include warm temperatures, well-draining soil, and adequate sunlight. Special considerations include planting depth and protection from pests. The difficulty level is generally easy, but ensuring proper environmental conditions can be challenging. Steps for propagation: 1) Obtain high-quality seeds; 2) Plant seeds 1.5-2 inches deep in fertile, well-draining soil after the last frost; 3) Water regularly, keeping the soil moist but not waterlogged; 4) Provide full sunlight and a warm environment (above 60°F); 5) Thin seedlings if necessary for optimal growth.