Stephanotis seeds are ripe when the pod turns yellow. Pick the pod and split it open before it splits open on its own. If allowed to fully ripen and split open, the seeds will go into a complicated dormancy. But if harvested at the just-ripe stage, they should germinate readily if sown on the surface of a seed starting mix and just barely covered with mix (or vermiculite). Keep evenly moist and at 70-80 degrees F to germinate them. It can take several weeks to several months for them to germinate.