Overwintering Mandevilla Indoors or Dormant: Pruning, Light, and Temperature Needs

Two Viable Strategies

Mandevilla splendens and hybrids are tropical vines (Zone 10+). In cold climates, choose:

Option 1: Houseplant

• Prune to manageable size (½ or more).
• Bright sunny window (south/west).
• Water when top inch dries; no fertilizer in winter.
• Keep cool (60–70 °F) to reduce stretching.
• In February, prune again and start monthly fertilizing.

Option 2: Forced Dormancy

• Leave outside until cool (45–50 °F / 7–10 °C).
• Cut back hard to 12 inches.
• Store in dark, cool garage/basement.
• Water barely—just to prevent total desiccation.
• Bring to light/warmth in early spring; resume water/fertilizer.

Key Points

Mandevilla blooms on new growth. Pruning + fertilizing in late winter = summer flowers. Never overwater in winter.