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Preparing Container Plants for Winter

For most of us, the first hard frosts of fall mark the end of container gardening season. Here are some tips for tidying up your dead or dormant plants, moving your favorites indoors, and cleaning up and storing your containers for the winter.

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Relocating Tender Plants Indoors

If your containers include tropical plants or tender perennials that you plan to overwinter indoors, start getting them used to their new environment well in advance of freezing temperatures, (and before you turn on your home's heating system). Water them well and set them in a shady, protected spot for a few days before bringing them indoors. During this time, check them over carefully for signs of pest problems and treat them with an insecticidal soap if necessary.

Decide which plants are worth saving. Although it is tempting to bring all of our container plants indoors for the winter, most of us simply don't have the space. To help decide which plants are worth saving, ask yourself the following questions:

  • Can the plant be easily replaced? When space is limited, plants that are difficult to find, expensive to buy, slow to grow, or highly sentimental should take priority.
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  • How much space will it need? Large plants take up more room. Taking a few cuttings at the end of the season is a great way to preserve larger plants and while saving some space.

  • Which plants would you enjoy having inside for the winter? If a plant offers pretty flowers (begonias), colorful foliage (coleus), or a nice fragrance (rosemary), it may be worth the effort of overwintering it indoors.

  • What are the plant's growing requirements? You may actually have more space than you think when you consider that not all plants need a warm, sunny space to survive the winter. For example, begonias can get by in a bright, but cool spot, such as an enclosed porch. Some tender perennials, like cannas, go totally dormant. As long as they don't dry out, they will survive nicely in a frost-free corner of the garage.
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Protecting Hardy Perennials

If you are growing hardy perennials and are willing to risk losing them, just water them enough to prevent them from drying out and let them be. If you can't risk losing them but you don't have room for them indoors, here are several ways to increase the odds that they will survive outdoors:

  • In areas where winter temperatures are well below freezing, extra steps are needed to protect the plant's roots. This may mean sinking containers into a trench filled with sand, soil, or compost, or moving them to a sheltered spot next to a building and covering them with several inches of mulch.

  • Containers that are too large or too heavy to move can be wrapped up in the insulating blankets made for hot water heaters. The blankets are easy to cut down to size and they can be reused year after year. Look for them at home centers and hardware stores.
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  • One of the most dependable options for protecting hardy perennials is to remove the plants from their containers and plant them in a holding bed until spring. An alternative is to bring them into an unheated garage or porch, where they will stay cool but not frozen.

  • In high wind areas, consider spraying container-grown evergreens with an anti-desiccant product to help prevent their foliage from drying out.

Cleaning and Storing Containers

Soil expands as it freezes, and even the best containers will crack if soil is left in them over the winter. Your containers will last much longer if you empty them out and store them inside. If they are light enough to move, dump any remaining plant debris and potting soil into your compost pile, and scrub containers with a stiff brush or scouring pad to remove any remaining dirt.

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Finally, rinse them with a solution of one part bleach to nine parts water and let them air dry. Containers should be stacked upside-down in a frost-free environment like a basement, garden shed, or garage. Weatherproof containers (not ceramic or thin-walled terra cotta) can be turned over and left outside, providing you remove the potting soil.

Container planters on a porch.
 

About The Author: Ellen Brown is an environmental writer and photographer and the owner of Sustainable Media, an environmental media company that specializes in helping businesses and organizations promote eco-friendly products and services.

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October 22, 20110 found this helpful

If you have geraniums in containers, you can remove the plant, and most of the soil attached, then cut them down to about 4 inches and place just the plant(or plants) in a paper grocery bag and store the bag where it won't get frozen.

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In the spring, check them occasionally as they will start growing out and then after all chance of frost is over, you can plant them back in their containers and enjoy them for another year.

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