Overwintering Thunbergia (Blue Sky Vine) Indoors

A blue thunbergia vine grown on a trellis in zone 6 was brought inside for winter. It’s alive but leggy, with growth only at the top.

Thunbergia Is Not a Houseplant

It’s typically grown as an annual outdoors. Indoors, it needs a cool, sunny spot (e.g., unheated sunroom). Winter care:

• Water sparingly—just enough to keep alive.
• No fertilizer.
• Prune sharply in early spring before new growth starts.

Spring Transition

Move to stronger light, resume watering and fertilizing, and harden off before placing outside after frost danger passes.

For more blooms next year: full sun outdoors, regular feeding, and don’t overpot.