Do Hyacinths propagate?? Or are they like most tulips....good for a couple
of years and then start to fritter out....

It probably depends on climate and location. If you plant them deep enough, say
8 inches, in halfway decent soil with at least half a day of sun, they are
there forever. At least I can speak for Zone 5. They will multiply slowly until
you have a very nice showy clump.

Iris,
Central NY, Zone 5a, Sunset Zone 40
"If we see light at the end of the tunnel, It's the light of the oncoming
train."
Robert Lowell (1917-1977)