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You will need to plant plumeria seeds or cuttings to grow your own plumeria. Unfortunately, these are not very commercially available. It can be a challenge to find them, so your best bet is to obtain them from someone who already has a plumeria. Perhaps a neighbor or relative already has a plumeria and would be willing to share these with you. The seeds and cuttings can be harvested in the spring or fall to allow for the propagation of the plant. Seeds and cuttings can also be found online on websites like Amazon, although there are some concerns about the quality of these, since plumeria seeds and cuttings lose viability within a few months. This involves placing the seeds in a wet paper towel for one full day. They will absorb the moisture and look slightly swollen, indicating that they are ready to grow. This will help them to take root more quickly. Make sure they are in a warm environment while germinating. To plant plumeria seeds or cuttings, fill the container with soil and insert the seeds about .2 inches (about 5mm) into the soil or the cuttings about 2 inches (about 5cm) into the soil. Pack soil firmly around the seeds or cuttings to hold them securely in place. If planting seeds, make sure the swollen end is at the bottom and that part of the seed wing sticks out of the soil. Only plant one seed or cutting per pot. You can plant them originally in a smaller pot (about 500 mL or 16.9 fluid ounces) and then transplant them into a larger pot (2.5 gal or 9.5 liters) after the seed begins to grow in about a week to a month. The smaller pots are known as cultivation pots and can be helpful for a plant that is just beginning to grow. When you first plant your plumeria cutting, do not water it immediately. New plumerias are very delicate and their root systems will grow with minimal water. Simply make sure it has enough light and heat for about 3 weeks and then begin to gradually add water. Start by adding a half cup of water to the plant each week. Water any pre-started plants thoroughly; there is no need to wait.  In about a month or two, the plant will begin to grow leaves. This means you can regularly water it each week. When leaves are about 5 inches long, it means the plumeria is rooted and you can water it thoroughly. Once the seedling is at least 3 inches tall, you can transplant it into a larger pot. Simply remove the seedling with its soil and place it in a larger container filled with potting soil, at least a gallon in size. Simply cover the roots with soil and pack it firmly in its new pot. Opt for a plastic pot or black nursery container if possible.

Summary:
Obtain seeds or cuttings. Germinate the seeds. Plant the seeds or cuttings. Wait to water any cuttings. Transplant the seedlings.