Taking Hardwood Stem Cuttings
Hardwood cuttings may split into two groups: broad-leaved evergreen cuttings, such as holly (Ilex) or rhododendrons and leafless deciduous cuttings. As the tissue from both types is firm and woody, they are easy to maintain in a healthy condition before propagating; however, they are often slow to root. Fully mature, hardwood (or ripewood) cuttings are normally taken from mid-autumn to early winter using ripe, vigorous shoots from the current season's growth.
Taking the Cutting
- Take a cutting at the junction of this and last season's growth; this should be approximately 22 cm (9 in) long.
- Trim the stem to approximately 15 cm (6 in) lengths by cutting just below buds or leaves at the base and just above them at the top. It is a good idea to make a straight cut at the base of the stem and an angled cut at the top - this way you will know which way up to plant the cutting.
- Remove any remaining leaves from deciduous cuttings and trim evergreen leaves from the lower two-thirds of the stem. Cut any large leaves in half across.
Indoor Propagation
- Dip the cutting into hormone rooting powder.
- Fill a container with cuttings compost, make a hole using a dibber or pencil and insert the cutting.
- Firm and water in gently.
- Place the pots in a cold frame.
- Water the cuttings regularly and keep them shaded in sunny weather.
- Harden off before planting out.
Propagating Outdoors
- Dig a slit trench 15 cm (6 in) wide and deep. This can be done by simply pushing a spade into the soil and pulling it to and fro. This trench is best made in a sheltered place, but not underneath trees or shrubs that drip.
- Add a layer of compost mixed in with grit or sharp sand. This will assist drainage and stimulate rooting.
- Push the cuttings into the trench 7 cm (3 in) apart and back fill the trench with soil so that the cuttings are held upright.
- Firm the soil and water in well.
- Re-firm the soil after heavy frosts and water during periods of drought.
- The cuttings may only take a few months to root; however, it is best to leave them for at least a year before transplanting them in the following dormant season. This will give them the best chance to develop an extensive root system.