FYI, Both are considered 'invasive species of concern' in Maryland and water hyacinth is on the Federal noxious week list. I wonder if other water gardeners could suggest better options? Would be a shame to have won the battle over one noxious weed (the ivy ) and intentionally bring in others :(

Water hyacinth freezes to death in the winter. Down in more tropical locations it can be a serious problem, but at 3000ft elevation it turns to mush rather quickly. The parrot's feather is gonna be yanked out when the time comes as well. The pond is in an enclosed courtyard, too small for waterfowl to use (A major way floating plants move around), and on a completely enclosed system. I'm not planning on putting either species in a wild or uncontrolled habitat. Invasive is a relative term. Also, the federally listed species of water hyacinth is Eichhornia azurea, I was looking for Eichhornia crassipes. But that's splitting hairs. I have experience in aquariums/greenhouses with water hyacinth and parrot's feather and I know they're excellent for hiding fish larve from their hungry parents. If anyone can recommend another species which has finely divided roots or leaves that guppy/paradise fish fry can mature in, please recommend it.
Peace,
Nate

This is gardengranma, the hostess. If any one has water hyacynth or underwater plants , parrot feathers etc. I'd sure like some. You are welcome to what you want to dig when you come.

I'm also looking for a source for parrot's feather.
It did nicely in my pond a few years ago and died out over the winter.....so I would like some more if anyone has any.
thanks.......
Bonnie