irie ▁that ▁has ▁been ▁res eed ed ▁after ▁p low ing ▁or ▁other ▁disturb ance . ▁ ▁Pra irie ▁garden ▁ ▁A ▁pra irie ▁garden ▁is ▁a ▁garden ▁primarily ▁consisting ▁of ▁plants ▁from ▁a ▁pra irie . ▁ ▁Phys i ography ▁ ▁The ▁originally ▁tre eless ▁pra i ries ▁of ▁the ▁upper ▁Mississippi ▁bas in ▁began ▁in ▁Indiana , ▁and ▁extended ▁west ward ▁and ▁north - west ward , ▁until ▁they ▁merged ▁with ▁the ▁d rier ▁region ▁known ▁as ▁the ▁Great ▁Pla ins . ▁An ▁east ward ▁extension ▁of ▁the ▁same ▁region , ▁originally ▁tree - cover ed , ▁extended ▁to ▁central ▁Ohio . ▁Thus , ▁the ▁pra i ries ▁generally ▁lie ▁between ▁the ▁Ohio ▁and ▁Missouri ▁rivers ▁on ▁the ▁south ▁and ▁the ▁Great ▁L akes ▁on ▁the ▁north . ▁The ▁pra i ries ▁are ▁a ▁contribution ▁of ▁the ▁gla cial ▁period . ▁They ▁consist ▁for ▁the ▁most ▁part ▁of ▁gla cial ▁dr ift , ▁depos ited ▁un con form ably ▁on ▁an ▁underlying ▁rock ▁surface ▁of ▁moder ate ▁or ▁small ▁relief . ▁Here , ▁the ▁rocks ▁are ▁an ▁extension ▁of ▁the ▁same ▁strat ified ▁Pala e oz o ic ▁form ations ▁already ▁described ▁as ▁occurr ing ▁in ▁the ▁App al ach ian ▁region ▁and ▁around ▁the ▁Great ▁L akes . ▁They ▁are ▁usually ▁fine - text ured ▁lim est ones ▁and ▁sh ales , ▁lying ▁horizontal . ▁The ▁moder ate ▁or ▁small ▁relief ▁that ▁they ▁were ▁given ▁by ▁m ature ▁preg la cial ▁er os ion ▁is ▁now ▁buried ▁under ▁the ▁dr