An aspirin added to the water would preserve the flowers.
Adding aspirin to the water is better for overall plant health.
Preserving flowers does not have to improve overall plant health.
exists e2 e1 x1 x2 x3 x4.(n_flower(x4) & n_water(x2) & to(e1,x2) & Theme(e2,x4) & Actor(e2,x3) & v_preserve(e2) & (x2 = x3) & Actor(e1,x1) & v_add(e1) & n_aspirin(x1))
exists e1 s1 s2 x1 x2 x3 x4 x5.(n_water(x3) & for(s1,x4) & n_health(x4) & of(x4,x5) & n_plant(x5) & a_overall(s2) & Theme(s2,x4) & Theme(s1,e1) & a_good(s1) & to(e1,x3) & Theme(e1,x2) & Actor(e1,x1) & v_add(e1) & n_aspirin(x2) & n_thing(x1))