Soaking Plumeria seeds before planting can help aid germination. Placing the seeds in warm water for 24 hours before sowing can soften the seed coat and improve water absorption. This process can accelerate the germination process by encouraging the embryo inside the seed to swell and initiate growth. However, not all Plumeria seeds require soaking, and some may germinate perfectly well without it. If the seeds have been stored for a long time or are known to have a tough seed coat, soaking can be beneficial. Gardeners can experiment with both soaked and unsoaked seeds to determine which method works best for their specific batch of seeds.