Hello, I live in Tallahassee FL, (zone 8b), and just bought two Jungle Jack’s mini plumerias, a ’Pizzazz’ and a ‘Malika’, both are his large size 5 gal plants. I plan to plant them In the ground in nursery pots so that I can pull them out of when the temps get low enough to damage the plants. This probably will occur during the months of January and February. I don’t want to up-pot them every year. So what size pots are recommended for long term use before up-potting is needed for these two varieties?