Hi Diane, it COULD be just the storage alone - I dig up my Zantedeschias every winter and store them dry in the basement - round about 9°C - and I've never had any trouble getting them to flower as long as they get adequate light in summer. I guess leaving them in the ground in BC in winter deprives them of the drought stress they get in winters in South-African summer rain climate. Maybe the GA3 s(t)imulates a natural process happening when the plant gets dry? Am 08.09.2019 um 00:37 schrieb Diane: > Thank you for the explanation, Mark. > > So, the bulbs would need to be dug up every year in order to be treated. I wonder if the parental species are some that require fires before they bloom in the wild. > > Diane > > _______________________________________________ > pbs mailing list > pbs@lists.pacificbulbsociety.net > http://lists.pacificbulbsociety.net/cgi-bin/… -- Martin ---------------------------------------------- Southern Germany Likely zone 7a _______________________________________________ pbs mailing list pbs@lists.pacificbulbsociety.net http://lists.pacificbulbsociety.net/cgi-bin/…