One method of plumerias (frangipani) propagation is through stem cuttings. The stem cutting must be at least 1.5 feet long. The stem chosen must be mature – at least a year old – and should not have flowered yet. Once cut, keep this portion aside in a shady place to heal the wound. Also remember to remove the leaves from the stem cutting. This cutting can be taken for planting. In tropical regions, plant plumerias (frangipani) between January and March. Dig a 1.5 feet deep, square shaped pit. Fill this pit with a mixture of red soil and compost in the ratio 1:1. Place the stem cutting into this hole to a depth of about 3 inch. During the initial period, the cutting requires very little water. New leaves and branches will start sprouting in about a month. A number of plumerias (frangipani) varieties including the Plumeria Obtusa can be planted this way. Varieties such as the Hanging Windmill can be planted in pots.
There is another propagation technique adopted for hybrid varieties of plumerias. The bark of the plant is peeled off from a mature plant stem. Remove it in a circular shape. Make sure this stem is kept in dry conditions. Now cover this portion with a plastic sheet containing coconut husk and red soil. After one month, small roots can be seen growing from the cut portion. You can cut out this portion for planting.
Seeds are very rarely used for Plumerias propagation. Pollination doesn’t normally take place in Plumeria due to the unique shape of its flower. Seeds can be developed only by artificial pollination. If these seeds are used for propagation, sow them in loose soil. Sprinkle sufficient water over the seeds. It will take at least 3 years for these plants to start flowering.