Yes, everyone thinks of the outdoors when thinking of gardening and what to plant, but when working with marginal plants or generally with propagating ones own plants indoors is just as important. This is especially true of marginal and tender plants for those of us who lack an unlimited budget. Fortunately for me I have a basement where shoplights can be hung over makeshift shelves and where there is light there is hope. Using windows never worked well for me, not enough light came in and none of it overhead. If you can find a place to rig a 4-foot shoplight you will be amazed how many plants you can grow. Am still learning how to best use my space even after 30 plus years: the basement, the just above freezing porch, and yes occasionally the windows.