Hi again, Dodge! Is it Melampodium? I don't know if it has a common name or not. Mine are 18 inches tall and wide, but started out looking like yours. I have them planted with some dark purply blue petunias ands ome of those Bush Morning Glories that are yellow centered with a white ring and purpley blue edges...the variety 'Dwarf Ensign'. The combination is fantastic!
Melampodium has odd seeds
-- when you find a dead flower
, see if the seeds
don't remind you of little Grape Nuts (the cereal) They are really dry and sort of square-ish...well, they have flat sides like Grape Nuts LOL!