I'm happy with the Bidens to the left, but feel like there needs to be something of intermediate height added to that space. Something independent and non-fussy, that will grow big enough not to have to be rescued from vines every year. The intermediate sized stuff at the middle left in the picture is naturalized Chinese privet and somehow it doesn't count. I'd like to get rid of all of it all. The tree and bushes growing in the distance to the left are wax myrtle, coastal pepperbush, American beautyberry, and swamp titi. I have several small serviceberries that I found them growing wild in various places and potted up last year that can go out next year. I also have 3 redbud seedlings that should be ready to go out next fall. Although that stretch to the left is low, it's often quite dry in the summer. Any suggestions would be welcome.
Edited to add this picture.
To the strips of Bidens I want to add tall perennials, something that I can mow over with the tractor early in the growing season to keep vines and woody plants down. The plants need to be able to tolerate drought as well as short-term flooding. I know that swamp sunflower fits the bill. The Joe Pye that grows wild here really likes a lot of moisture, growing in ditches or even in standing water, so I don't think it would thrive there. I think groupings of white Hibiscus coccineus could work. Perhaps ironweed or green coneflower too.