From a botanical perspective many flowers ripen pollen at an earlier time than they are receptive. This prevents self fertilization. Sent from Yahoo Mail on Android On Fri, Aug 10, 2018 at 19:07, David Pilling<david@davidpilling.com> wrote: Hi, On 10/08/18 02:32, George Goldsmith wrote: > Are there other significant factors, related to the pollen or the stigma One rough idea is that when the flower is producing pollen it is not receptive to it. Sometimes you can see changes in the flower which indicate when it is receptive. I see to recall Ian Young (SRGC Bulblog) discussing when the best time for pollinating various bulb flowers is. -- David Pilling http://www.davidpilling.com/ _______________________________________________ pbs mailing list pbs@lists.pacificbulbsociety.net http://lists.pacificbulbsociety.net/cgi-bin/… _______________________________________________ pbs mailing list pbs@lists.pacificbulbsociety.net http://lists.pacificbulbsociety.net/cgi-bin/…