Diana, Most flowers are either destroyed or resist. However, now you mentioned it, I noticed that some petals of Moraea polystachya 'curle up' to resist better to the potential damage. But for the Dahlia -4° (24F°) is the fatal temperture. The leaves of certain species become floppy and darker, but recover to normal wihin a few days (Lachenalia, Aapanthus, Amaryllis belladonna) Greetings Lauw de Jager http://www.bulbargence.com/ South of France -----Original Message----- Did the flowers that were not damaged change themselves while it was cold? For example, I can tell how cold it is outside by seeing how tightly the rhododendrons roll their leaves. No need to go outside or look at a thermometer - just look out the window.