Mandevilla Winter Survival in Illinois: Pot or Mulch

Depends on Ground Freeze Depth

If soil doesn't freeze solid, cut back and mulch heavily (12–18″). Roots survive; spring regrowth occurs.

Safer: Pot Up

1. Prune to 3 ft.
2. Lift root ball; pot in large container.
3. Indoors in bright light; water sparingly.
4. 5 months of "unhappy but alive" is better than death.