Nicotiana tabacum is a perennial, so long as frost does not kill the root. Some years ago, I toyed with leaving seedlings in a 3" pot, and just keeping them there, indoors, through the summer and subsequent winter. The following spring, I moved them (still in their 3" pots) to my front porch for the growing season. Whenever they grew too tall and gangly, I snipped off the stalk, and allowed a sucker to replace it.
In their
third growing season, they were transplanted to the garden bed, to see how they would perform. Some of them were working on their 5th stalk replacement. As you can see from the sample photos above, they did okay. The quality of the leaf was okay, but not great. Some of the 5 or so varieties that I tried in this testing simply showed the whites of their eyes, as soon as they were sent out on their own, and promptly died.
Bud Bags: cotton for bud bags works, though they become quite heavy when wet, and the seed production seems to be somewhat reduced because of greater heat retention. The older and more worn out the sheet, the better it will perform. If it's a polyester blend, then you won't have to worry about unsightly wrinkles.
Bob