For true bulbs, daffodils, tulips, onions, Hippeastrum, etc, the flower is initiated by temperature extremes when the bulb enters dormancy, it then requires a period of temperature fluctuations, and the opposite temperature extremes to release hormones which cause the embrionic flower, and it's stem, to develop. With a corm I believe that this whole process happens as the shoot (stem) of the corm is in growth. As I understand the process, a dormant corm does not contain an embrionic flower. Peter (UK) On Tue, Jun 30, 2020, 8:11 PM The Silent Seed via pbs < pbs@lists.pacificbulbsociety.net> wrote: > Sometimes they do not form / flower if they weren't stored at optimal > temperatures. (For example; daffodils sitting in a bag, in a "warm" place > usually will bypass a year before flowering again, after being planted. > Great question. I'll be curious to learn about this. > > > On Tue, Jun 30, 2020 at 3:01 PM Diane via pbs < > pbs@lists.pacificbulbsociety.net> wrote: > > > > > When you buy flower bulbs, the flower is already present, squished > > inside. I’ve never cut a bulb open to see how developed the flower is. > > > > I wonder when they begin to form? When do conditions have to be right > for > > this to happen? > > > > Have any of you bought bulbs that did not flower? > > > > This question was triggered by my bletilla corms producing only leaves > for > > nine years. > > > > Diane Whitehead > > Victoria, British Columbia, Canada > > _______________________________________________ > > pbs mailing list > > pbs@lists.pacificbulbsociety.net > > http://lists.pacificbulbsociety.net/cgi-bin/… > > > > > -- > The Silent Seed > Rare and Unusual plants from around the world. > thesilentseed.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/…