There are bloom pics here:
Snake Plant (Dracaena trifasciata)
IDK about all species but S. trifasciata is monocarpic. Like a Bromeliad, each rosette can bloom once. After that, the mama rosette can live for quite a long time, and keep forming new pups. As each pup reaches its' maturity, it will bloom, then continue the colonization process of forming more pups.