Certified GKH Gardening Expert
The best way to propagate shrimp plants is from cuttings. You can grow them from seeds, but if the plant is a hybrid, you won't get the same plant as the parent.
To collect seeds, let the flower turn black. Look for a tiny seed pod. When the seeds are ready, they eject from the pod. You can enclose the pod with a bag to catch the seeds or harvest the seedpods when dry and store them till they eject the seeds.