Hi John — you can definitely keep Lavender Chiffon in a big flower pot! And “big” is the good description, since you’ll not want to have to replant your Rose of Sharon anytime soon once you have it in the big pot, so make sure to use a pot with plenty of room for the plant to grow and develop. For the Winter season, you’ll want to either put this plant in a garage or shed, or next to your house in a sheltered spot. Pots tend to dry out quickly, so make sure to give it just a bit of water from time to time, if the Winter doesn’t provide rain and snow naturally. Keeping it sheltered helps protect it from winds which will dry out the pot and possibly break off the stems. I hope this helps!