The best time to sow Plumeria seeds for germination depends on the region and climate. In regions with cold winters, it is recommended to sow the seeds indoors during late winter or early spring, when temperatures become milder. This allows the seedlings to establish before the growing season. In tropical or subtropical regions, where temperatures remain warm year-round, seeds can be sown at any time. However, germinating seeds during the warmer months allows them to benefit from the favorable growing conditions. Gardeners should consider the local climate and plan their seed sowing accordingly to give the seedlings the best chance of thriving.