Virtually all shrubs can be propagated in this way. The following respond particularly well.
- Azalea Peg down shoots into a peaty soil. Roots form slowly, taking about 12 months.
- Camellia Best rooted in peaty soil. Takes about 12 months.
- Lilac (Syringa) Roots in about 6 months in sandy soil.
- Magnolia Takes 12 months to root. Peg into peaty soil and keep moist.
- Rhododendron Best rooted in peaty soil. Roots form slowly, taking at least 12 months.
Five subjects to propagate by air layering
The following plants cannot be propagated by normal layering, as their branches cannot be pulled down to the soil. Air layering “injures” the plant to encourage it to put forth roots and the stem is cut beneath the new roots.
- Croton(Codiaeum) Needs warmth and high humidity (greenhouse/house plant). May take about 12 months to root.
- Rubber plant (Ficus) Needs warmth and high humidity to root (greenhouse/house plant).
- Witch hazel (Hamamelis) Very difficult to propagate by other methods. Takes 12 months.
Eight subjects to propagate from root cuttings
This list includes both shrubs and perennials
- Anchusa Roots easily in a cold frame.
- Border phlox Lay the thin cuttings flat and cover with 1.25cm/1/2in compost. Root in greenhouse or cold frame.
- Drumstick primrose (Primula denticulata) Root cuttings in a cold frame or greenhouse.
- Mullein (Verbascum) Some are short-lived, so propagate regularly, rooting in greenhouse or frame.
- Ornamental quince (Chaenotneles) Cuttings best rooted in greenhouse or cold frame.
- Oriental poppy (Popover orientale) Very easy to propagate in a cold frame.
- Sea holly (Eryngi m) Very easy to propagate in a cold frame. Roots very easily.
- Stag’s horn sumach (Rhus) Cuttings best placed in a cold frame. Roots very easily.
Five subjects to propagate from leaf cuttings
Even the inexperienced gardener will find the following ,:greenhouse and house plants very easy to propagate successfully, as long as growing conditions are controlled.
- African violet (Saintpaulia) Use whole leaf plus stalk. Needs plenty of warmth and high humidity. Can also be propagated by division of larger plants.
- Begonia(Begonia rex) Lay entire leaf flat on compost, after cutting through veins on underside. Needs constant warmth and high humidity to encourage root formation.
- Cape primrose(Streptocarpus) Cut the long leaves into 5cm/2in sections. Insert vertically. Needs warmth and humidity. Can also be propagated by division.
- Mother-in-law’s tongue(Sansevieria) Cut the long leaves into 5cm/2in sections and insert vertically. Best in dryish air. Can also be propagated by division.
- Pepper elders(Peperomia) Use whole leaf plus stalk. Needs plenty of warmth and high humidity.
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