What garden pond plants are best for zone 5?
I have about a 350 gallon pond with a waterfall. The pond is lined.
What plants can be used with a lined pond given there is no soil at bottom to plant anything in?
In a lined pond, put your plants in a pot or leave them in the pot they came in. Make sure the top of the pot is about 1" below the water surface. Tropicals like lotus or tropical water lilies will not do well where you live, but there are many aquatic plants that will. Hardy water lilies will be wonderful and make it through your wicked winter. Here's an article I wrote about more hardy pond plants:
To find more pond information, go to pondlady.com