Cyrtanthus breviflorus is best propagated by seeds, to achieve a better yield. Seeds need to be collected from the plant as soon as the capsules are dry and about to split, to avoid losing the seeds, because they are lightweight and can easily be blown away by the wind. They can be stored in an airtight container in a cool, dry place for up to 6 months. Sow the seeds in early spring in a medium with good drainage, such as a mixture of 50% washed river sand and 50% sifted acid compost. Moisten the medium before sowing the seeds to avoid the floating of seeds from the surface. Sprinkle a fine layer of seeds on the medium and cover them with a 3-5 mm thick layer of the same medium. It takes up to 3 weeks for the seeds to germinate. Seedlings should be grown on for at least 2 years before transplanting them.

The plant can also be propagated through the separation of offsets from the main bulb. This method should be conducted in spring, after flowering. The offsets need to be planted immediately after separating them from the main bulb. Always use a well-draining medium to prevent the bulb from rotting. After planting, water the plants sufficiently, then repeat once or twice per week, allowing the medium to dry in between watering. The watering needs to be reduced in the dormant winter season. Propagated plants must be placed in a well ventilated green house with enough sunlight, especially in the mornings.