okay, skip the corners
move all the anacharis to the left corner(the only empty corner)
push the DW forward 2"-4", and then plant the small vals around the DW
like this................................... O= DW and X = vals
x OOOO x
x x OOO x x
x x x x x
kind of like that, and once the anacharis or the vals get taller, move them behind the DW