It is possible to grow bougainvillea from seeds, although using cuttings is the more frequent propagation method. You’ll need to hunt for the seed pods on a mature plant in the fall. Bear in mind that the true flowers of a bougainvillea are small and white and the color comes from its bracts – locate the seed pods inside the flowers. Collect the pods and dry them. The seeds from the pods can be germinated in seed compost. They’ll need the warmth of a heated propagator or to be kept in plastic bags, and they may take a while to do so.