I am starting a water garden with a bog area but I do not know what plants are hardy in my area. they will be outside year around. My pond is 18 foot round by 3.5 feet deep and the bog areas are 2 feet out around 2 sides of the pond. I am making my own filter. I need to find out plants can work and where I can find them cheap, I am not a rocafeller and I can not afford much, So I need Help.