is legal in BC. It is legal here in Illinois too, but illegal to ship across state lines. Don't know the Canadian rules.
Water Hyacinth needs a lot of light and is a heavy feeder. Those who try to over winter it indoors usually either starve it in terms of light (they get long and spindly while reaching for the light - guess how I know) or they may even starve in terms of food. One pond guy I know, leaves them in a well lit bucket. The roots extend down into some well seasoned manure.
If you could hand a light over your tank, on a 16-18 hour time, producing 3-4 watts per gallon or more, your hyacinth might male it. The light would have to be just far enough away to not burn it. If it worked, they are such "heavy feeders" you might be amused by your ammonia, nitrate and nitrite readings. :)
Many plants dwarf indoors and survive. I don't think WH dwarves very well.
A couple of similar plants (in many ways) are water lettuce and Salvina. They will dwarf. I have used them to starve out hair algae via their shade and ability to take nutrients out of the water.
For instance, outdoors Salvinia natans, in the sun, could be 5cm wide and 15 cm long. Indoors, any distance from the light, the whole plant is likely less than 2 cm wide and each leaf may be less than a cm across. Water lettuce, which can be 23 cm across outside, seldom is more than 4 cm across in my tanks. They still hang quite a few roots.
I was hoping that Angelhologram would tackle this question. I think her experience with WH is far greater than mine.
Another interesting idea would be to set up a plant filter (maybe in a large tub) with those plants under a couple of powerful lights. Water could be run from a tank or tanks to the plant filter and back.
Good luck and all the best.
unc