overwintering cuttings

A few years back I overwintered cuttings taken that June in quarts sunk in
the ground.  Didn't do so well here in Zone 5.  Last year I overwintered
cuttings in qts and 4 inch in the garage and they did great.  It ranges
maybe 40 to 550 in there.  This year I was ultra-successful with cuttings
and have a bout 4 trays of 2inch and 4 inch pots of young shrub cuttings
which I know wouldn't make it outdoors, so they'll be garaged.

My question is, how much light do they need over winter in these conditions?
I have one window in the garage and it's packed with overwintering grasses
and other plants.  Since these cuttings won't go totally dormant over
winter, won't lose their leaves, will they survive on a shelf with very
little light?  Or do I need to set up fluorescents for them?

Thanks for any help you can give.

Kitty

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