Overwintering Potted Perennials in Zone 3–4 Ontario

In Ottawa-area winters (Zone 3b–4a), container plants need protection. Here's a species-specific plan for your four plants.

Miniature Rose

• Bring into an unheated garage or cold room (35–45°F / 2–7°C).
• It will go dormant—leaves drop, canes look dead. Don't panic.
• Water once a month, just enough to keep roots from desiccating.
• In April, move to light, water, and fertilize.

Fuchsia

• Treat like the rose: cool, dark dormancy.
• Cut back to 6″ before storage.
• Check monthly for moisture.

Swedish Ivy (Plectranthus)

• Keep as a houseplant in a bright, cool window (50–60°F).
• Water sparingly; pinch to maintain shape.

Impatiens

• Can bloom all winter in a south window.
• Keep evenly moist, fertilize monthly with half-strength bloom booster.
• Watch for spider mites—shower foliage weekly.

Critical Step for All

Before bringing in, treat soil with systemic insecticide granules (e.g., Bonide Systemic Houseplant Insect Control) to eliminate fungus gnats, aphids, and other hitchhikers.

A cool, bright mudroom or enclosed porch works perfectly for this mixed group.