How To Install Winter-Proof Planters

Properly insulating and preparing your planters can protect your plants from harsh winter conditions and help them thrive year-round. This guide will walk you through the process of installing winter-proof planters, from selecting the right materials to maintaining your plants throughout the season. 

*Unless otherwise noted, costs in this article reflect an average of prices that our team found from hardware stores like Lowes and Home Depot, and on Amazon.com.

Choosing the Right Winter-Proof Planters

Selecting suitable planters is important for winter-proofing your outdoor plants. Consider the following factors when choosing your containers.

Planter Material

The material of your planter plays a significant role in its ability to withstand winter conditions. Some suitable options include:

• Concrete
• Fiberglass
• Polyethylene
• Wood (with proper treatment)

These materials are durable and resistant to cracking in freezing temperatures.

Planter Size

Larger planters provide more insulation for plant roots, making them better suited for winter use. Aim for containers that are at least 12 inches in diameter and depth.

Drainage

Proper drainage helps prevent water from freezing and damaging your plants. Make sure your planters have adequate drainage holes at the bottom.

Insulating Your Planters

Insulating planters is necessary for winter-proofing. Protection from temperature fluctuations promotes root health. Here’s the process of insulation:

1. Measure the inside of the planter from top to bottom and around the circumference.
2. Cut rigid foam insulation to fit these measurements, leaving space at the bottom for drainage.
3. Place the insulation inside the planter, lining the sides but not the bottom.
4. Secure the insulation with waterproof tape if necessary.

In the video above, This Old House landscape designer Jenn Nawada demonstrates how measuring and cutting the insulation provides a snug fit.

Preparing the Planter Base

Before adding soil and plants, it’s important to prepare the planter’s base for proper drainage and root health:

1. Cover drainage holes with terracotta pot shards to prevent clogging.
2. Line the bottom with landscape fabric to maintain soil integrity.
3. Add a layer of gravel or pebbles for extra drainage.

These steps provide excess water the means to escape, preventing root rot and freezing issues during winter.

Selecting Winter-Hardy Plants

Opt for species that withstand cold temperatures and limited sunlight. Ideal choices include:

• Boxwood
• Evergreen shrubs
• Heuchera
• Ornamental kale
• Winter pansies

Nawada focuses on boxwood as the centerpiece, with ivy as underplanting to create a lush effect.

Planting and Soil Preparation

Proper planting and soil preparation are essential for winter-proof planters:

1. Fill the planter with high-quality potting soil, leaving room for your plants.
2. Remove plants from nursery containers and gently loosen root balls.
3. Center the primary plant, such as boxwood, in the planter.
4. Add underplanting around the edges, like ivy, for fullness.
5. Fill gaps with soil, making sure plants are secure.

In the video, Nawada demonstrates proper planting positioning and securing techniques.

Watering and Maintenance for Winter Plants

Watering and maintenance are incredibly important for winter planter health:

Watering Schedule

Thoroughly water your plants after planting. In winter, reduce watering but prevent total soil dryness. Regularly check moisture levels, especially for planters in sheltered areas without rain.

Protecting Plants From Wind

Winter winds can be harsh on plants, but there are protective measures to help minimize damage. Burlap wraps or windbreaks provide extra shielding from strong gusts while applying an anti-desiccant spray to evergreen foliage helps seal leaf pores, protecting the plants from drying out. 

Placing planters in sheltered spots can further safeguard them from the cold winds. Nawada advises that using an anti-desiccant spray is particularly effective in preventing the harmful effects of winter winds on plant health.

Mulching

Applying mulch provides extra insulation and helps plants retain moisture during colder months. Good options for mulch include pine needles, shredded bark, and straw.

Additional Winter Protection Techniques

Clustering planters together creates a microclimate, allowing them to share warmth and better withstand cold temperatures. Elevating planters helps prevent the ground from freezing underneath while covering plants with frost cloth or burlap during severe cold spells offers additional shielding from frost. It’s also important to clear snow from branches to avoid potential damage from the weight.

Spring Transition for Winter Plants

As winter wanes, prepare planters for spring:

1. Gradually remove winter protection as temperatures rise.
2. Prune dead or damaged growth.
3. Increase watering frequency with active plant growth.
4. Add a slow-release fertilizer to restore nutrients.

Incorporating Visual Elements in Planters

Consider the look of your winter-proof planters. Incorporating elements such as decorative stones, thematic pot colors, or complementary plant pairings can elevate the visual appeal. Coordinating colors with seasonal themes—like using whites and blues for a wintery feel or reds and greens for a festive touch—can make your planters a focal point even amidst snowdrifts.

Additionally, lighting elements can transform your winter planters into enchanting displays. Use solar-powered lights to create an eco-friendly ambiance. Twinkling fairy lights intertwined with plant branches or LEDs strategically placed at the planter’s base offer a warm, inviting glow during short winter days.

Plant Maintenance Throughout the Winter

Monitor your planters regularly throughout winter. Even the hardiest winter plants benefit from occasional checks for signs of distress, such as wilting or discoloration. Rotating planters can distribute exposure to elements evenly, providing longevity and vibrancy of plant life.

Handling Snow and Ice

Snow and ice can weigh down plants and obscure their beauty. Gently shake off excess snow from branches, and use tools like soft brooms to remove ice accumulation. Be cautious to avoid damaging the plants. Regular maintenance helps sustain the health and aesthetics of your winter planters.

Encouraging Wildlife

Consider plant selections that encourage birds and wildlife. Installing feeders near planters can attract feathered visitors, adding dynamic life and movement to your winter landscape. Opt for evergreens and berries that provide food and shelter for wildlife, creating a harmonious ecosystem right at your doorstep.

Sustainability Considerations

Sustainability is a growing consideration in gardening. Choose eco-friendly materials when selecting planters, opt for organic soils and fertilizers, and incorporate water conservation techniques like rainwater collection for irrigation. By adopting sustainable practices, your garden will not only endure winter but also contribute to environmental well-being.

Resources

Nawada planted two boxwoods and underplanted them with ivy. Both of these plants and potting soil can be found at home centers. She reused the planters the homeowner already had, but planters similar to that can be found at the home center as well.

To insulate the planter, Nawada cut squares of FOAMULAR 150 rigid foam board insulation, which is manufactured by Owens Corning.

Nawada also used broken shards of old terra cotta pots to allow for more drainage at the bottom of the planter, which can be found at any nursery or home center. To protect the boxwoods during the winter, she recommends spraying an anti-desiccant spray. The one she referenced in the workshop is Wilt Pruf.

Shop Planters at The Home Depot

Shopping List

Planters
Rigid foam insulation
Boxwoods
Ivy
Potting soil
Terracotta pot shards
Landscape fabric
Anti-desiccant spray