Jane, Any plant that survived 3 days @ 20F is likely to survive 2 weeks or more. If the cold is going to kill a bulb it will usually do do in the first hour. I have a hoop house and a glass house both with heaters and thermostats set to 35F. Seedlings in flats, outside the greenhouses, will either survive with the snow as protection or will die within the first hour. Marc Rosenblum, Falls City, OR zone 8b On 1/13/2024 9:08 AM, Jane McGary via pbs wrote: > After no significant frost this year, the Pacific Northwest is > experiencing a sudden severe cold snap. My bulb collection is exposed > to ambient temperature, though covered against moisture. Everything is > now frozen solid. The temperature is not expected to rise above > freezing for about five days. What I wonder is, once a plant in growth > is frozen, does it matter how long it remains frozen? Almost all the > plants in my bulb house have previously survived about 20 degrees F > for three days. Is five days going to be worse? Or do I just give up > on all possibilities of survival because the plants were in unusually > early growth? There are about 1,200 different species concerned. I did > bring emerging seedlings into the garage before the freeze hit, but no > protection was possible for the plunged pots in the bulb house. Any > cover would have blown off in the present high winds -- the falling > snow is whirling around as the wind gusts constantly shift. > > Explanations of hardy plant response to prolonged freezing welcome. > > Jane McGary, Portland, Oregon, USA > > > _______________________________________________ > pbs mailing list > pbs@lists.pacificbulbsociety.net > https://lists.pacificbulbsociety.net/cgi-bin/… > Unsubscribe: <mailto:pbs-unsubscribe@lists.pacificbulbsociety.net> > PBS Forum > https://… _______________________________________________ pbs mailing list pbs@lists.pacificbulbsociety.net https://lists.pacificbulbsociety.net/cgi-bin/… Unsubscribe: <mailto:pbs-unsubscribe@lists.pacificbulbsociety.net> PBS Forum https://…