When to Move Hibiscus Outdoors in Cold Climates

When to Move Hibiscus Outdoors in Cold Climates

A reader in Walters Falls, Ontario (zone 5a) has two potted hibiscus plants that winter indoors. Daytime temps reach 14–18°C (57–64°F), but nights drop to 2–9°C (36–48°F). Is it safe to move them outside?

Rule of Thumb

Wait until nighttime temperatures consistently stay above 10°C (50°F). Moving them out earlier risks damaging flower buds, resulting in fewer blooms all summer.

Transition Tips

• Start by placing them in full shade for a few days.
• Gradually increase sun exposure over 1–2 weeks.
• Monitor nightly lows—bring them back in if a cold snap is forecast.
• Water and fertilize regularly once they’re actively growing outdoors.

Patience now means a spectacular floral show later.