Marginal plants are used in the shallow part of your pond. Water plants are listed with a hardiness zone where they are best grown, but with some care most water plants can be kept year-round. Most water plants are listed as hardy or tropical. For those of us living in Metro Denver, depending on our Winter, "hardy" translates to mean zone 5 or 6. A tropical to us is normally zone 7. What that means is any plant with a zone 7 or higher must be protected, while zone 6 is borderline. Protection can mean protection from freezing to treating the plant as a houseplant for the Winter.

 

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