Plastic containers are usually resilient enough to tolerate freezing, while certain natural pot materials, such as untreated terra cotta, readily absorb water, which can expand when frozen and end up cracking the pot. Care Considerations. 3. It is up to gardeners if they prefer to over-winter plants indoors or if they prefer to buy those annuals and tropicals from year to year. In winter, clematis containers can be moved to a more sheltered position against the house, behind a hedge or moved indoors to a garage in order to protect the flower from the elements. Planting Clematis in Pots. For heavy containers that are not suitable to move easily, bubble wrap can be used around the container, and a burlap or horticultural fleece over the plant itself. Planting Clematis plants in your containers. deep and wide (45cm) and have good drainage holes. I have lots of Clematis in the ground, some old and some just out of the pots last year. Those conditions can damage the root system. Be sure to use a large container for clematis, because the extra soil in the planter will help protect the roots in the winter and during hot summer days. All I do is place a few boards over the pot to keep snow and ice from sinking into the pot and place a tarp over the whole thing, keeping it down with a couple bricks. Alternatively, stick your clematis in a large pot and pop it in a cold greenhouse over winter, ready for planting out in spring. I agree with the others and would say your Clematis ahould be fine in a pot over the winter in your zone, The winter weather here in Scotland can be anything from zone 5 - 3 but NOT for very long periods. Comes through with … Stick your finger in the soil. Clematis needs moist soil, even when it's not growing in the winter. Make sure your container is strong enough to last through winter. Select a container that is at least 18 in. It takes mine at least 3 years to look really good. Gardeners will grow potted clematis in containers on patios, balconies, in the entryway of the home, on a deck or even in a modern garden. Little Quick Fire ® Hydrangea. 3 top tips for growing winter clematis The root system is in a pot rather than inside of the ground, which exposes them to freezing air temperatures and drying winds. Plant the rootball of your clematis plant in the center of the container and fill in over and around it with more potting soil, up to 3 inches from the top of the planter. I don't have a lot of room to over-winter plants in my house and I have animals that tend to eat any plant that I bring into my home. One thing I also do is put a few Blushing Susie seeds, Cardinal Climber seeds and Japanese Morning Glory seeds in some cups on the window sill and have lots of annual vines very cheap. If you opt for a large or vigorous clematis that grows over 8 ft. tall (2 m), select a larger container. Even if you picked perennials that are hardy to your zone, perennials in containers are subject to harsher winter conditions than those perennials planted in the ground. Good choices for a container that is going to be left outside include plastic, composite, metal and wood pots. Although I have, at times, successfully left pots of this type out all winter, I knew I was risking breaking the pot. I have my Madame Julia Correvon in a whiskey barrel sitting outside all winter long. Be mindful of the material your container is made of. The more porous a container is, the more likely it will be to crack. Double Check Your Container . Read on to discover our recommendations and top tips, then check out our best plants for winter colour for more ways to brighten your outside space in winter. Personally, I prefer to buy annuals from year to year. Select a type of clematis that grows well in containers such as Sugar Candy, Madame Julia Correvon, Niobe or Snow Queen. Water the plants at least twice a week.