The time it takes for Plumeria seeds to germinate can vary depending on environmental conditions and seed viability. Generally, Plumeria seeds may start germinating within 1 to 4 weeks after sowing, but it can take up to several months in some cases. Factors such as temperature, humidity, and the quality of the seeds can influence germination speed. Gardeners should be patient and provide consistent care to encourage successful germination. Regular monitoring and attention to the germination process will help ensure the best results in growing Plumeria from seeds.