Overwintering Mandevilla (Sun Parasol) in Upstate New York

Indoor Winter Care

Mandevilla cannot go dormant; it must be kept actively growing indoors. Basement storage will kill it.

Winter Protocol

1. Move potted plant to a sunny south/west window.
2. Water sparingly—just enough to keep soil from bone dry.
3. Do not fertilize.
4. Prune only if needed for space; hard pruning in spring.

Spring Transition

When nights exceed 50°F, gradually acclimate outdoors over 7–10 days (hardening off). Resume regular watering and fertilizing. Plant will regain vigor and bloom profusely.