Some tub and patio plants can also stay outside in winter. This includes fruit and ornamental shrubs. However, it is important to protect the roots from severe frost. Sinking the pots or tubs into the ground is an effective means of protecting them from the average frost. Protect the parts of the plant above ground with the help of airy materials such as straw or leaves inside straw mats wrapped around the shrubs. Bring any planters and earthenware vessels that are not frost-resistant into the house.