Tony, As John and Ellen confirm, this must have something to o with region of origin of the various populations. The same cause of the difference in flowering period was noted for Gladiolus dalenii. Greetings Lauw de Jager Le 28/02/08 13:26, « Tony Avent » <tony@plantdelights.com> a écrit : > I continue to be fascinated by how climate affects flowering time. > Kniphofia rooperi flowers here from August-October.