I'm not exactly sure that's really a question of the geophyte type, at least in families that vary in their storage organ. Iridaceae seem to be all about current conditions and will react to them - both Tigridieae (true bulbs) and Crocoideae (mostly corms, some rhizomes) have species which may flower first year from seed, so they don't need to have pre-formed flowers in the storage organ. Most core Amarylloideae seem to have them, but I'm not sure at all for Allioideae and Agapanthoideae - I guess you can have flower leek the first year from seed? I guess it's overly simplistic to reduce it to the classification of the storage organ. Am 30.06.2020 um 21:27 schrieb Peter Taggart via pbs: > 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) > > -- Martin ---------------------------------------------- Southern Germany Likely zone 7a _______________________________________________ pbs mailing list pbs@lists.pacificbulbsociety.net http://lists.pacificbulbsociety.net/cgi-bin/…