wrapping up a container plant
Even the hardiest trees and shrubs need a little help when they’re living in containers. Roots get colder and dry out more quickly when they’re surrounded by such a small amount of soil. Containers are also vulnerable to freezing and could crack as the soil inside expands. To prevent this, once you’ve wrapped up your container, you might move it into your garage and raise it on a brick or two.
Step one — Wrap the container with a couple layers of insulation, such as this bubble wrap — its air cells are great insulators. Burlap or even an old quilt will do, too.
Step two — Drape the branches with burlap. This fabric helps to cut the drying effects of harsh winter winds and protects the bark against uneven warming, which can cause sunscald. Secure the burlap with twine in a spiral from top to bottom. The twine shouldn’t squeeze the branches too tightly — just enough to hold the burlap in place.