Overwintering pond plants

We live in southwestern Michigan along the Lake Michigan shoreline. The size of our pond is about 2500 gallons with deepest depth of 3 feet. This is my first winter to overwinter three shallow water plants--swamp rice, dwarf cattail, water celery. Have a 12" ledge that I can lower them down to. Ice will not go down to this depth. Can I leave them there over the winter or should I plant them in the ground? My parrots feathers I have removed and kept in a bucket of water over the winter indoors in cool room. That seemed to work or is there a better method? Thank you.

Doug says - lots of questions in one here. The 12" depth should be just fine for the hardy plants.

Water celery? If you're talking about Vallisneria (grass-like) - then it should be fine as well. If it's Oenanthe (broader leaf) - then it's a tropical and will have to be protected like the parrot feather.

Parrot feather - I generally kept mine in a lit aquarium with a heater (it's a tropical). That grew amazingly over the winter and I had tons for the following spring. I never planted it - I would just toss it into the pond and it grew like a weed. But this is one tough plant and if a bucket worked for you... :-)