The length of time Plumeria seedpods stay on the plant before splitting can vary depending on several factors, including environmental conditions and species. Generally, once the seedpod has fully matured and turned green or brown, it will start to split open within a few weeks to a couple of months. Some seedpods may take longer to split, while others may open relatively quickly. Gardeners can monitor the seedpod’s progress and readiness for harvest by observing its color, texture, and any signs of splitting. Once the seedpod starts to split, it is an indication that the seeds are ready for collection and further propagation.