Primary propagation methods for vismia include seed sowing and cuttings. Key factors for success are bright light, warm temperatures, and well-drained soil. Special considerations involve scarification for seeds to improve germination rates and using rooting hormone for cuttings. Overall, propagation can be moderately difficult due to slow germination and rooting. Steps: 1) For seeds, scarify and sow in warm, moist soil; 2) For cuttings, take semi-hardwood sections, apply rooting hormone, and plant in a mix of perlite and peat. Patience is essential as both methods take time to establish.