Water Hyacinth indoors

Water Hyacinth indoors

Greetings all! :) I got myself a water hyacinth (eichohornia crassipes) a few weeks ago and it looks like it's not very happy with me.. The top of the plant is looking fine but leaves in the bottom layer (mostly under water) are withering away. I'm keeping it in the jar it came in, which is deep but doesn't give it much space to float. It also doesn't have any nutrients in the water.. That I need to fix, yes? I don't know anything about caring about water plants inside unfortunately. I hear these kind like sun so I'm putting it by the sunny window. (Should I worry about the roots getting sun as well?) Most of the information I find on the net are about growing these plants in ponds or how to combat them when they're taking over your lake. Although I will be able to put it into our pond when the summer is here I'm going to have to keep it alive and well until at least the end of May if not longer. (I'm in Finland, I'm not putting a tropical plant in cold water.)
my room

my room

New here

New here

Container garden success!

Container garden success!

Large scale composting

Large scale composting

monarch, and a tomato question

monarch, and a tomato question

Plant id

Plant id