Hi, some of those look like irises I have, and they've been passed down from a generation or two, sometomes tended and sometimes abandoned. Which means they are survivors. Mid-August is generally a good time to dig up, divide, and replant. I'm sure you can find the how-to's online but my main contribution is this advice: I love 4 or 5 rhizomes planted in several small areas. They will be easier to tend and the bloom impact will be showstopping. Don't bury the rhizomes (only bury the fiber-like roots), do use diatomaceous earth and neem spray especially in spring, to keep out iris borers, and look into feeding times and fertilizer types, and add epsom salts, about 1 tablespoon to gallon, a couple times in spring. Keep the base clear of debris, winters in TN haven't killed them. Good luck!
