Usually flasks are sent ready for deflasking. You can hold off if you keep them under a flouro light for 1/2 the day. If you plan to keep them in the flask, then you will need to keep an eye on developing fungus/bacteria in the flask which can happen and wipe the flask contents out within days. You will see a change to the media surface or the plants will start to go brown/black.
Just curious, why are the cooler days a problem? I'm assuming that these will be inside, so it shouldn't be a concern for them. Those flasks look more than ready to be deflasked.
__________________ Camille
Completely orchid obsessed and loving every minute of it....
You do have a point there about why the cooler weather would matter...
I think I'm just being a bit pedantic about whether or not they could handle the Winter. I would have just put them outside with my other collection just with a bit more care.