If you can keep them growing vigorously, they should probably be fine. I think that growers usually have them growing and in flower for spring sales in this manner. How well you can do in a windowsill, remains to be seen.

When you say "starts"... are you saying you bought them as plugs or you received from someone else as just first year seedlings that were dug up from their own garden?

in my MI ... window sills can get really cold ... and the media also ... so watering could be an issue ... wet damp soil next to a window can get real cold at night.. when the furnace is set lower ...

babe or not ... i would have probably slapped them in the ground in your zone ... they are not foo foo plants.. babe or not ...

in the alternative ... i would have put them near the foundation in full winter shade.. let them go dormant.. and then tipped them over ... all the better if they got buried in snow ....

i would not have fooled with the garage .... just adds a level of complication.. that this plant just doesnt need ...

all that said ... have fun with it indoors ... its a roll of the dice.. but i am thinking.. you will enjoy it during an otherwise drab winter ... go for it ...

ken

DBarron, yeah, I have no idea how long they’ll like the windowsill. I’ll just keep watch on them, I guess. :)

Nevermore, they were seedlings (I think?) from a trade. Hoping they come true to type. We’ll see.

Ken, thanks for the water warning. I’v been keeping them very much on the dry side as I am far more scared of rot than desiccation. And I did put half of them in the ground. These were just insurance in case those don’t make it. Yes, I’m already loving it watching them grow. :) I go crazy over the winter.

Don't we all (go crazy over the winter)? I feel like skipping one winter for growing out will probably be ok. As long as you can keep them growing, if they start losing leaves, head them toward a cold (but not freezing) garage.
And don't let them dry out TOO much...they're young and not as well rooted as mature plants.

If they are just a small amount of leaves from a small crown... I would get them under lights and try to keep them warmer... make them think it's still growing season. Either a shop lights or if your only have a few.. Then a strong compact fluorescent light should do. Having weak winter light and colder conditions will probably cause issues.

but since you have some outside too... You can just see what happens. last... Your comment about them coming true.... If they are seedlings from the new fancy hybrids... Most times they don't come true... But sometimes you get lucky. Do you know what what type you are hoping they are?