I need plants for a 2 1/2' deep pond; it's 12 x 12. Have goldfish but no koi. The plants should sit on the bottom in a pot ----- up to 1 gal. but would prefer smaller ones. I'd like the plant to come 1' to 3' out of the water. One that will overwinter in zone 7 would be great but not "must haves". I don't need any floating plants; I have plenty. Thanks.