Sowing seeds needing Darkness?

Good Day, Everyone!
Do you all have your snow shoveled?
Naw, I don't either.

I am starting some of my perennial seeds.
A few Lupines are already up.

I have several seeds that I am wanting to plant that need Darkness to 
germinate.
    Centaurea
    Delphinium
    Lupin
    Myosotis
    Pansies
    Papaver
Thought my list was longer but this is all I see right now.

My question is this:
How do I go about giving them the Darkness they require for germination?
I am confused b/c I have started Delphs and Lupins without doing anything 
special.
But some of the other listed I have had little or no luck.
Am I making this difficult?
Thank You and Best Wishes!
Barb
USDA Zone 5, Rock Island, IL
"What this country needs is dirtier fingernails & cleaner minds."  Will Rogers
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