I noticed these pylons among drifts of red Poppies from the window of a train last week. So I walked to the spot to take a photo from the other direction (note the train in the distance).

 The chalky fields of Hertfordshire are heavily farmed (and sprayed) but leave one fallow for a year or two and a collection of arable weeds soon appears, particularly the Corn Poppy (Papaver rhoeas). The seeds can remain dormant in the ground for years then germinate when disturbed (but not sprayed).