Plants are growing in a planter box.
They are young tomato plants.
Plants need  not always refer to tomato plants.
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 p1 x1.(n_thing(x1) & exists s1 x2 x3.((x1 = x2) & n_plant(x2) & of(x2,x3) & n_tomato(x3) & a_young(s1) & Theme(s1,x2)))