If you leave the flower spikes alone I've noticed they sometimes continue to spit out one or two blooms for a while, even if the spike is largely spent. What I do is just cut off the spikes once they are mostly spent.

josal:
You can as hawkeye suggested you should also have some seedlings start showing up. It may take a while for the
Hummers to find your Salvia's I have a whole yard full
of different species and they are still finding it. I
have 1-2 hummers visit on their way from and then back to wintering area's in Mexico
Art

Thank you both for your advice. I haven't planted yet as we had frost last night and it's forecast for tonight, but I'm looking forward to happy hummers this season.

Hummingbird certainly use all the types of coccinea. The only downside to the species is flowering shuts down in the afternoon in really hot weather. Most of us who grow lots of coccinea, at least the ones I know, do not deadhead them. There is no reason since their continuous growth covers up most of the seedheads. Coccinea is also an excellent plant for seed eating birds. Goldfinches take the seed as it ripens and migrant sparrows like White-throated Sparrows use it all winter. It is an amazingly abundant seeder.