On Tue, May 25, 2021 at 12:27 AM Robert Lauf via pbs < pbs@lists.pacificbulbsociety.net> wrote: "I'm intrigued by the mention of "orangeness" in the red forms. Has anyone tried simply keeping those plants quite cool during flowering?" In my experience, and in communication with others, it is light intensity, rather than temperature, that increases the intensity of redness in "red" flowered Clivia. Gowers in more northern latitudes, which have lower sunlight intensity and/or more inclement weather, have trouble getting the stronger coloring in most all Clivia. Exposing the Clivia, if possible, to outdoor, unfiltered (no *artificial* overhead covering) sunlight while the flower buds are developing greatly increases the intensity of color. (I think this has to do with increased production of anthocyanins induced by higher levels of light, especially sunlight.) Of course, this may not be possible due to freezing temperatures and inclement weather, and one needs to be careful to not overexpose the Clivia to direct sunlight. Increased artificial lighting seems to help, too, but to a lesser extent. That said, cooler temperatures during the blooming phase, commencing from when the blossoms start to open, significantly increases the longevity of the bloom period. Regards, Mike zn. 7, cool mediterranean, W. Washington where it is cool and cloudy with intermittent rain today. _______________________________________________ pbs mailing list pbs@lists.pacificbulbsociety.net http://lists.pacificbulbsociety.net/cgi-bin/… Unsubscribe: <mailto:pbs-unsubscribe@lists.pacificbulbsociety.net>