Winterizing a Frost-Damaged Mandevilla: Pruning, Propagation, and Care

Assessing Frost Damage

A red Mandevilla that flourished outdoors all summer was brought inside after a possible light frost. Leaves are mostly dry, but the plant can likely recover because Mandevillas tolerate brief dips into the high 40s (°F).

Step-by-Step Winter Care

1. Light Fertilization

Apply a liquid fertilizer diluted 1:2 with distilled water (or follow package directions for granular, then dilute equally). This gentle feeding supports root health without forcing tender growth.

2. Hard Pruning

Cut the entire plant back to about 12 inches above the soil line. This is standard winterizing practice and removes frost-damaged foliage.

3. Propagate the Cuttings

• Cut removed vines into 6–8 inch sections.
• Strip the lower 2–3 leaves, leaving 3–4 leaves at the tip.
• Dip the cut end in rooting hormone and place in distilled water.
• Once roots reach 1 inch, pot into fresh potting mix.

4. Pest Inspection

Thoroughly check leaves, stems, and soil for insects, mites, or eggs before settling the plant indoors.

5. Light and Water Regime

• Place in the brightest possible spot (south window or under grow lights).
• Keep soil on the dry side: allow the top third to dry between waterings, but never let it become bone-dry.

Spring Transition

When moving the plant back outside, the new winter growth may scorch—this is normal. The plant will quickly replace it with fresh, vigorous shoots and resume blooming.