I agree with Jim, and caution against being quick to water Summer dormant bulbs, in pots, too early. Watering early, if it is done, should be no more than a light damping down. The species of Haemanthus which I have grown do not need a drenching to tell them when to grow. Wait for fluctuating Autumn temperatures. Peter (UK) On 14 August 2015 at 16:54, James SHIELDS <jshields46074@gmail.com> wrote: > Hi Stephen, > > In my experience, the winter-growing sorts are triggered by temperatures > (chilly nights) and probably also the calendar. An occasional flood in the > greenhouse does not usually start them growing in mid-summer. Cool nights > in June do not start the bulbs to flowering. > > Jim > > On Thu, Aug 13, 2015 at 7:50 PM, Stephen Putman <putman@pobox.upenn.edu> > wrote: > > > > > What is the trigger for new growth in these winter growing species in > > autumn? Is it temperature? This would mean to wait for an appropriate > > temperature and then water. If the trigger is water, then the issue > would > > be at what temperatures would a moist medium be beneficial, and when > fatal? > > >