you dont want to plant anywhere that may get flooded low spots that flood is a bad choice, would say go with whatever strain you want but you probably cant go with a pure sativa due to the longer flowering times it probably wouldnt finish in your area but ther is alot of indica/ sativa crosses with shorter flowering times im sure even ww would get fairly good sized outdoors.

you could use a 5 gallon bucket if you do not want to stick them in the ground you may atleast want to paint them so they dont stick out so bad and drill alot of holes in the bottom for drainage.