You do not have to empty every container when autumn arrives. Some shrubs and perennials can remain in pots and provide foliage through winter, provided the plant, container and location suit the cold. Green Mountain boxwood, Japanese pieris and bergenia are three possibilities from the original planting list, each with a different shape and season of interest.
What changes when a plant stays in a pot?
A plant in the ground can reach beyond its planting hole for water. A potted plant depends on the water and nutrients available in a smaller volume of soil, so you still need to check it after summer ends. Its roots are also more exposed to cold than roots in the ground. A common starting point is to choose a plant rated hardy about two USDA zones colder than your location for an exposed pot. That is a guideline, not a promise: winter wind, the size of the container and its position all matter. For the practical side of watering and potting mix, see container basics.
Which plants offer winter interest?
Green Mountain boxwood grows slowly and has a naturally upright, pyramidal shape. Its deep green foliage can give a container structure when the summer flowers have gone. Place it away from strong winter wind where possible, and turn the pot from time to time if one side gets more light. If you are considering boxwood elsewhere in the yard, our boxwood article offers more context.
Japanese pieris is another evergreen shrub to consider. Compact selections such as ‘Dorothy Wyckoff’ bring dense foliage, hanging clusters of spring flowers and new leaves that may show reddish, salmon or pale tones depending on the variety. As with boxwood, a sheltered position can help prevent winter exposure from spoiling the display.
Bergenia changes the scale of the planting. Its broad, glossy leaves can take on burgundy tones in fall, and it produces flower clusters in spring. Give it a pot that drains well; standing water around roots is a poor start to a winter planting. The follow-up post, plants for containers all year, part two, covers more candidate plants and the care of the containers themselves.
