Sharon, The locale whereof you inquire is indeed left relatively wild through all seasons, every once in a while a tractor mounted mower is utilized to keep the foot paths accessible.
I think I read somewhere about the pokeweed's stainibility, but not about it's stainibility sustainibility.
Returned to said site yesterday, on a quest to find evidence of Monarch migration; last year and the year before found massive gatherings of Monarchs at this locale; so far, just a few Monarchs...however, the wild stands of Goldenrod do attract a fair amount of different butterflies.
Buckeye
Painted Lady
Monarch
Hairstreak
Some other wild flowers encountered on expedition -
Sawtooth Sunflower
Smartweed
Thistle
Rudbeckia
Prairie Grasses - red
gold
Horse Nettle
Moth Mullein
Boneset
Bidens
Heath Aster
Queen Anne's Lace
Fleabane
Wood Sorrel
Ironweed
Tick Trefoil
Evening Primrose
Partridge Pea