I am really not a flower master, it is only a few days, the green water hyacinth makes me raise a yellow muscle thin, and she is not good at this flowering period? Defeated in only one day. appear

I am really not a flower master, it is only a few days, the green water hyacinth makes me raise a yellow muscle thin, and she is not good at this flowering period? Defeated in only one day.

Now I want to prune the leaves, remove the yellow leaves, how to start ah, only cut the upper leaves, or the bulging poles below also cut off.

And after this flower is defeated, how to deal with this flower stem, where to cut it [thinking]