The water hyacinth is a free-floating perennial
which flowers easily in a sunny spot,
and spreads to fill its watery home . . .
sometimes too fast for its own good.
Best suited to man-made ponds or
open containers of fresh water,
the water hyacinth doubles its population
every two weeks . . .
which can cause big problems in lakes and ponds
as an unwanted invasive species.
Find a sunny spot in your yard, add a couple
of bulbous water hyacinths to a tub of water
(and make sure it's not chlorinated),
and you'll be blessed with purple blooms all season long.
The base stems form hollow bulbs of air
which keep water hyacinths floating on the surface.
(Pretty neat trick.)