When shopping, if temperatures are near freezing, plants and flowers should be covered on the way to the car. Although a shopping bag is helpful, a scarf or coat will give more protection.
Flowering plants should be placed where they get natural light. You may want to move them so they can be near a window, at least part of the time. Poinsettias are sensitive to cold drafts, so place them away from doorways to the outside.
Potted flowers with decorative foil are in danger of getting too much water. Foil traps water which drains out of pots. This water wicks back into the soil and may saturate it so that there is not enough soil air for plant roots. To avoid this problem, you can remove the foil from the pot when watering in a sink and let the plant drain for a few minutes before replacing the foil. Or simply make a hole in the foil and place a saucer under the pot to catch the water. Far more plants are killed from overwatering than underwatering. If you are not sure if the soil is dry, test it with your finger. It is time to water when soil becomes dry on top.
Don’t forget to add water to cut flower containers. A fresh flower bouquet can use half its water in a day or two.