@roadkill expecting 35°F by morning. Everything tropical is going into shelter. Everything that is small enough. These kratom's are as big as I can wheel around. 7 gallon pots, about.
Greenhouse should hold to 40~45°F with heater on low. Chicken brooder hatching heating pad beneath the cuttings to keep their roots very warm and reduce damping off problems, hopefully. Clones REALLY need warmth to grow roots and not rot. Scary night ahead. This is definitely not the time to start clones.
Craig Strickland's kratom nursery grow had some damage there in Georgia. His most recent post on his YouTube channel is here :
Frost is heartless sometimes. I think that his many plants will mostly make it. Blessings.