Stems
Due to the positioning of cameras, it was not possible to measure stem xylem vulnerability simultaneously with other tissues, so this was quantified on four individuals of the same age and size. One section of stem was selected per plant between the root collar and the first reproductive structures. Using a sharp razor blade, a window of around 20 mm was carefully cut to remove the epidermis and cuticle, exposing the xylem. Water potential was monitored with a stem psychrometer as above and image capture protocols were the same as described for the petiole and peduncle.