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How to Overwinter Plants For The Winter

Published on November 2, 2020Last updated October 5, 2021 ♛ By Melissa J. Will

This post contains affiliate links.
Read full disclosure statement here.

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When gardeners overwinter their plants, they are providing special care for tender plants that would otherwise not be able to withstand the cold season. Keep your vulnerable plants safe from freezing temperatures with these smart storage tips.

For a helpful guide, get the Fall Gardening Checklist here.

Backyard garden in winter after snowfall.

What is Overwintering?

Backyard garden in winter after snowfall.

Some garden plants survive winter conditions fine on their own while others need help with “overwintering.”

When we overwinter a plant, we provide conditions such as insulation or shelter that enable it to survive the colder months.

Perennial trees, shrubs, flowers, and vines suited to our climate overwinter naturally. It’s the long-living tender plants that benefit from our help.


Contents

  • Overwintering Tips
    • Know Your Hardiness Zone
    • Living Annuals & Tender Perennials
    • Potted Trees
    • Vegetables
    • Bulbs & Tubers
  • Key Points

Overwintering Tips

Know Your Hardiness Zone

Do you know your plant hardiness zone?

Lookup: United States Plant Hardiness Zones | Canada Plant Hardiness Zones

This is a measure of the average low temperatures for your area. Garden plants and seeds are sold with tags indicating what zones they are suited for. This is just temperature-wise, though—not other growing conditions.

Anything long-living plant not suited to your winters could be a candidate for overwintering.


Long-living Annuals and Tender Perennials

Red Pelargonium flowers

A popular example of a plant we overwinter is geraniums (Pelargoniums). These are long-living plants sold as annuals because, without protection from freezing temperatures, they cannot survive.

To overwinter geraniums, we can move them indoors to grow as houseplants or provide cool storage where they go dormant (rest) until spring.

Any tropical or subtropical houseplants along with many annuals and tender perennials are also candidates for spending the winter indoors.

Tips: How To Bring Plants Indoors For The Winter


Potted Trees

Potted fig tree

Trees growing in containers may also need extra help to get through the winter. Tropical trees must come indoors to warm and humid conditions while semi-hardy and hardy trees do best with dormant overwintering in cool storage.

While the same hardy tree might survive the winter when planted in the ground, a container does not have the same insulation soil and mulch provide and the root ball may freeze. If the water within the plant cells freezes, it’s game over.

To overwinter a potted tree suited a zone warmer than our own, we can either insulate the container in place, partly bury the container in the ground (also known as “heeling in”), or move the tree to a sheltered location like an insulated shed or garage or unheated greenhouse and bundle it up so temperatures remain above freezing.

Tips: How to Overwinter Potted Trees in a Cold Climate



Garden image with examples of garden jargon words like bolting and deadheading.

Related: Garden Speak: Odd Terms That Confuse & Amuse New Gardeners



Vegetables

Broccoli growing in garden.

Cool-tolerant vegetables like kale, broccoli, spinach, carrots, and leaf lettuces can also be overwintered. These guys can survive whatever winter has to offer when tucked in with frost cloths, polytunnels, covered raised beds (“cold frames”), or greenhouses, also known as ‘season extenders‘.

Again, it’s all about preventing the water within their tissues from freezing. Growth is stalled when temperatures and light levels dip, but the plants will resume growth when warmth and light return.

Tips: How To Grow Vegetables Outdoors in The Winter


Bulbs & Tubers

Dahlia tuberous roots

Flowering bulbs like tulips and daffodils are hardy and can stay in the ground throughout the winter months.

Tuberous roots like dahlias are not that hardy and need extra protection to survive the cold.

The most common method of overwintering dahlias is to dig them up and keep them dormant in cold storage for the winter.

Tips: How to Store Dahlia Tubers (Overwintering)

Key Points

  • When we overwinter we take action to protect plants in the winter that would not otherwise survive.
  • Candidates include long-living annuals, semi-hardy plants, potted trees, cold-tolerant vegetables, and tender perennial bulbs and tuberous roots.
  • Options depend on the type of plant and include providing shelter, covers, or insulation with deep mulch or other materials to keep temperatures above zero and prevent plant tissues from freezing.

~Melissa the Empress of Dirt ♛

Backyard garden in winter after snowfall.
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Melissa J. Will - Empress of DirtWelcome!
I’m Melissa J. Will a.k.a. the Empress of Dirt (Ontario, Canada).
Join me as I share creative + frugal home & garden ideas with a dash of humor.
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