The seed capsules of Justicia flava burst open when ripe. To prevent the seeds from being lost, they should be collected as soon as the seed capsules turn brown. Sow the seeds in October. The seeds should be planted in a mixture of good soil, compost and river sand. Sow the seeds on the surface, pressing them down slightly. Place them in a shady spot and water them once a week with a fine sprinkler. Germination takes place after a week. Transplant seedlings when they reach a height of 200 mm.

Take cuttings during October and November, using stems of the previous season's growth. The cuttings should be 120 mm long and treated with a growing hormone such as Seridex no. 1. hormone powder. Place the cuttings in a mixture of good soil and river sand in equal parts. Ideal temperature for rooting is between 15-25ºC. Water twice a week. After rooting, transplant the cuttings in a good soil mixture and place them in 60% shade.