Colchicum autumnale is flowering here, unhappily, in soil which has had no moisture for six weeks. There are other colchicums in flower elsewhere in the garden. I thought watering would trigger flowering, but that's not the case. The way I understand it is that flowering is initiated by a programmed (X number of hours in the soil after the leaves wither in spring) degradation of starch in this season's corm, regardless of soil moisture content. If this season's corm is in the ground, cormlets will form and produce roots, which grow during the winter. This current season's corm will disappear when leaves are produced next spring. Bob Nold Denver, Colorado, USA On Wed, Sep 8, 2021 at 5:06 PM Jane McGary via pbs < pbs@lists.pacificbulbsociety.net> wrote: > I wonder if moisture triggered this flowering? My plants of C. > hierosolymitanum are not up yet -- only C. kotschyi is flowering in the > bulb house, which has not yet received more than a light sprinkle of > water to maintain a little humidity. I don't know what triggers > flowering in Colchicum. > > Jane McGary, Portland, Oregon, USA > > On 9/8/2021 2:59 PM, Arnold Trachtenberg via pbs wrote: > > This one flowered while still in the abasement for it's summer rest. > Took a couple of days for the flowers to color up. > > Arnold > > > > > > > _______________________________________________ > pbs mailing list > pbs@lists.pacificbulbsociety.net > http://lists.pacificbulbsociety.net/cgi-bin/… > Unsubscribe: <mailto:pbs-unsubscribe@lists.pacificbulbsociety.net> > _______________________________________________ pbs mailing list pbs@lists.pacificbulbsociety.net http://lists.pacificbulbsociety.net/cgi-bin/… Unsubscribe: <mailto:pbs-unsubscribe@lists.pacificbulbsociety.net>