5. Place pots in a bright, warm area out of direct sunlight. Water minimally to avoid rot—just keep the soil barely moist. Within four to six weeks, shoots will begin to appear from the cuttings; however, new roots will not have formed yet, so wait another two to three weeks before watering on a regular basis.
6. Once new plants are actively growing, place them in a sunny window, then harden them off for several weeks before planting in the ground.
Here are some woody plants and perennials suitable for propagation by root cuttings:
Shrubs, trees and vines
- Bottlebrush buckeye (Aesculus parviflora) Zone 4
- Japanese Angelica-tree (Aralia elata) Zone 4
- Cross vine (Bignonia capreolata) Zone 6
- Trumpet vine (Campsis radicans) Zone 4
- Northern catalpa (Catalpa speciosa) Zone 4
- Floweringquince (Chaenomeles spp.) Zone 5
- Panicled goldenraintree (Koelreuteria paniculata) Zone 6
- Blue passionflower (Passiflora caerulea) Zone 7
- Royal Paulownia (Paulownia tomentosa) Zone 6
- Smooth sumac (Rhus glabra) Zone 3
- Bear’s breeches (Acanthus spinosus Spinosissimus Group) Zone 5
- Alkanet (Anchusa spp.) Zone 5
- Japanese anemone (Anemone x hybrida) Zone 5
- Heron’s bill (Erodium spp.) Zones 4 to 8, depending on spp.
- Sea holly (Eryngium alpinum) Zone 3
- Hardy geranium (Geranium spp.) Zones 3 to 8, depending on spp.
- Sea lavender (Limonium latifolium) Zone 2
- Oriental poppy (Papaver orientale) Zone 3
- Garden phlox (Phlox paniculata) Zone 4
- Drumstick primrose (Primula denticulata) Zone 3
- Pasque flower (Pulsatilla vulgaris) Zone 4
- Mullein (Verbascum spp. and cultivars) Zones 3 to 8, depending on spp.