Water hyacinths exhibit two major forms of propagation: vegetative
reproduction occurs when daughter plants are formed along stolons
(runners), and under ideal conditions rates of new plant production
are unbelievable; sexual reproduction is achieved through seed
production.

Never release water hyacinths into the wild, and make sure they are
legal to possess in your state.

John Bachman wrote:

We have two water hyacinths in our new pond and they seem to be doing
well. They have doubled in size and appear healthy but have not
bloomed yet. Will they propagate? If so, how?

TIA

John