1. To grow a new and exciting cultivar.
2. To grow rootstocks for grafting.
3. But especially to see that unique flower for the first time.

It is possible to let Plumeria seedlings flower in less than 12 months and about 60% in 18 to 24 months. Most of the rest will flower from 24 to 36 months. But then you have to live in a different zone. (Some still take 3 years and even longer).

What you need are of course Plumeria seeds, something to soak them in, bowl of Chinese always does well, plugs or a good seedling soil mix to plant the seeds in, metal or plastic labels and permanent felt pen. Hydrogen peroxide for faster germination.