I am so not a fern expert, but I can tell you that I had lady ferns under similar conditions at my old house (across the street from a major post office with dieseling mail semis, three lots from a bus stop, and close enough to a ball park to create long summer traffic jams). My soil was sandy and cruddy to boot (though I did my best to mulch and amend), and the silver maple made things awfully dry. The lady ferns did fine, though they're lusher at my newer, slightly more bucolic digs. The Japanese painted fern did fairly well too, though I had that in a spot farther from the street and in a spot where it was more carefully tended.