I don't think you have much hope of those plants growing in existing sod and competing with the weeds.
Looks to me like a perfect spot for ditch lilies!
Linda C

I might invest a little work in it - pry up some of the bigger weeds, rake up the sticks and any other debris. Put down a few layers of newspaper, pile up any extra yard dirt, plant and grass clippings, used coffee grounds, etc. on top and build yourself a lasagna bed this season. (See Composting Forum) Certainly won't look any worse than a weedy ditch or a weedy ditch planted up with ditch lilies. (No offence meant and ditch lilies really can solve some problems.) But by throwing together a lasagna bed now, by fall you could throw in your seeds.

Question from someone in a cold climate. Do annual seeds live through the winter to sprout in the spring in NC? Why not just sow seeds in the spring?