Plants are growing in a planter box.
The plants are green.
Since the plants are growing in the planter box they would be green as they are alive and not dead.
exists e1 x1 x2 x3.(in(e1,x2) & n_box(x2) & of(x2,x3) & n_planter(x3) & Actor(e1,x1) & v_grow(e1) & n_plant(x1))
exists s1 x1.(n_plant(x1) & Theme(s1,x1) & a_green(s1))