This applies to true bulbs. In true bulbs the flower buds formation is triggered by temperature extremes at between the end of it's growing season, and the start of the new growing season. I believe that corms develop their flower buds on the current seasons growth shoots. I'm not sure what the position is for pseudobulbs (which is what orchids have), but this is why plant morphology really can matter. Peter (UK) On Tue, Jun 30, 2020, 8:01 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? > This question was triggered by my bletilla corms producing only leaves for > nine years. > _______________________________________________ pbs mailing list pbs@lists.pacificbulbsociety.net http://lists.pacificbulbsociety.net/cgi-bin/…