Rooting Mandevilla and Passionflower Cuttings: Water vs. Soil Method

A gardener has cuttings of Mandevilla vine and Purple Passion Flower in water. Asks if rooting hormone and soil are better, and how to find their hardiness zone.

Better Method: Soil + Hormone

Water rooting works but produces brittle roots. Soil method is more reliable:

1. Take 4-6 inch cuttings of new growth.
2. Strip lower leaves, remove flowers/buds.
3. Dip cut end in rooting powder (e.g., Rootone).
4. Insert into moist soilless mix in plastic pot (holds moisture better than clay).
5. Cover with clear plastic bag for humidity. Bright indirect light.
6. Keep evenly moist—not soggy. Vent daily.
7. Roots in 2-4 weeks.

Mandevilla Specifics

Tropical (zone 10+). In cold zones, overwinter indoors as houseplant or take cuttings in fall. If planted in ground in warm zones, mulch heavily.

Passionflower (Passiflora)

Many species; some hardy to zone 6 (e.g., P. incarnata 'Maypop'), most tropical. Identify species for proper care.

Finding Your Zone

Use USDA Plant Hardiness Zone Map (planthardiness.ars.usda.gov) by ZIP code. Or ask local nursery/extension.

Recommended Plant Sources

White Flower Farm, Wayside Gardens, Shady Oaks Nursery, Bluestone Perennials, Van Bourgondien, Van Dyck's, Brent & Becky's Bulbs, Plant Delights Nursery, Forestfarm.