your minimally heated shed sounds like a larger version of my "coolest windowsill" - that room is quite chilly! Peter (UK) On Sun, Dec 2, 2012 at 2:49 PM, Russell Stafford, Odyssey Bulbs < russell@odysseybulbs.com> wrote: > I routinely set out flats of hardy geophytes (e.g., Corydalis spp.) > in late fall and early winter, after average minimum temperatures > have dropped below freezing. But first the planted flats (which are > 16 inches square and 5.5 inches deep) spend at least 2 weeks in a > minimally heated shed where temperatures stay above about 4 degrees >