Propagation: Seeds arriving soon - need advice, 0 by Seandor

Seandor wrote:
I have ordered delphinium seed (Pacific Giant) and clear springs delphinium (a dwarf Pacific Giant), Camelot Mix foxgove, and Love-In-A-Mist Persian Jewels, Has any one attempted any of these as winter sowed plants? What is the germination rate? One in ten? One in twenty? or Eight of ten seeds germinate?

I have some seeds outside that were kindly given to me by a DG member. I have them in milk jugs outside on my driveway where they will get lots of sun - but is this too "exposed?" Today it is rather cold and windy. Do plants inside a milk jug feel a windchill? So far the temperatures have not dropped below 0 degree F, but it has been below freezing for a while now, and will probably remain that way during February.

Are the plants okay on the black driveway (we live in an urban centre on a normal city lot).

Thanks :-)