This is growing equally tall (4-5 feet) in stoney clay and in old terraced garden soil...the areas are open but with trees all around the edges.... really nothing else is growing with it except an occasional sweet gum sprout and a bit of poison ivy around the edges.
EDIT...we think the odd numbers of petals varying from flower to flower is a clue...they seem to grow that way and it is not from loosing petals.
"We're all just walking each other home." -Ram Dass
"Be a lamp, or a lifeboat, or a ladder."-Rumi
Location: Arkansas Ozarks zone 7 alluvial,black,deep loam/clay with few rocks, wonderful creek bottom!