Are you building it to be 6 feet wide or 6 feet tall? If you go high (which the frogs would prefer) then you could allocate more than 4" of substrate. Four inches isn't a lot for larger plants, but they will make do with the substrate by growing horizontally versus vertical and horizontal. Any smaller perennial will work ok, just take a stroll through the woods and do some collecting. a few things about field collecting plants; familiarize yourself with local species and laws, some plants are protected and removing them is a no-no. And if you pull a plant and it has a tap root (think dandelion) it will not work in only 4" of substrate.


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