I really like the way you do it because I am doing some thing similar. I have 6 fig trees in a raised bed where one side is the house. I made a wooden frame around the bed and planning to cover it with green house plastic sheets. Mine will be completely closed top and sides occationally I will open one side for air or if is too cold I will provide air with a fan. I don't care if it gets warm and the trees start blooming early I welcome that I might increase my season with couple of months. I brought my potted trees inside the house they have light track and fertilizer and they are blooming. I am looking for ways to beat our darn cold winter. I have Citrus trees too which is giving me a fit. May garage is turned to a little orchid. I am so glad to report that we have not had a freezing temp yet. The lowest temp my plant meter registered is 38 at night and 40s during the day. I am crossing my fingers to stay that way. May be AL Gore global warming is true.

I prefer Jasminum Sambac varieties due to the fact that Jasmine Tea is scented with their flowers. These tend to bloom every 30 to 40 days if given warm temperatures and good sunshine. Mine will have to come inside once temperatures drop consistently near 50 degrees. My family and friends who smell one of the flowers want more for potpourri and even cuttings. I think Hardy Jasmine is Jasminum officinale which is hardy to z6 sheltered or z7 for outside planting.

well im in a zone 8 in ga and it is to cold here for plumies to be outside in the winter. plumies cant go under 30-40 degrees. and they do go dormant. they loose there leaves too so dont think it died when it does lol(i thought that the first time lol) goodluck

I don't know how much cold those will survive. But at least while they're young they should be grown in pots so they can be moved into shelter in cold weather. Larger palms usually cope better.