Not all Plumeria seeds may germinate successfully, even under ideal conditions. Seed viability can vary depending on factors such as seed quality, age, and storage conditions. Some seeds may be viable and germinate quickly, while others may not be as viable and may take longer or not germinate at all. It is common for gardeners to sow more seeds than needed to account for variations in germination success. Even with proper care, there may still be some seeds that do not germinate. Regularly monitor the seeds during germination to identify which ones have successfully germinated and which ones may need further attention or re-sowing.