Yes, you can collect seeds from Plumeria cultivars and grow them into new plants. However, keep in mind that the resulting plants may not have the exact traits of the parent cultivar. Plumeria seeds exhibit genetic variation, and the offspring may resemble one of the parent plants or exhibit unique characteristics. If you want to preserve the exact traits of a particular cultivar, it is best to propagate it through vegetative means, such as stem cuttings or grafting. Growing Plumeria from seeds is an exciting way to explore new variations and experience the joy of cultivating these tropical beauties from their earliest stages.