What you’ll need:
- Sharp pair of secateurs
- Cutting board
- Pots filled with either cuttings compost or a 50/50 mix of free-draining compost and grit or perlite
- Grit for top dressing
Choose a well-established plant and dig it up during the dormant period and wash soil off the roots.
Look for long roots that are about a pencil width thick. Trace them back to the crown of the plant and cut the root off using secateurs.
Cut off the thin end of the root and any thin wispy side roots growing off it.
You can remove more similar size roots from the mother plant but make sure you take no more than one third of the roots. Otherwise, the plant may become weak.
Replant the mother plant as soon as possible.
Next cut each freshly cut root into sections, each between 5-10cm long.
When cutting the root into sections make sure you know which is the top end and which is the bottom end. The easy way to do this is to make a horizontal cut on the top of each section and a sloping cut at the bottom end.
Place each cutting into the pot, approximately 4cm apart, sloping cut first. Position them deep enough to leave the horizontal cut just below the soil surface.
Add a 1cm layer of grit to the top of the pot and then water lightly before placing the pot somewhere sheltered in the garden, ideally in a cold frame.
Be careful not to over-water or place in an area where it may get rained heavily upon, as too much water can rot the cuttings. That’s all you have to do until spring.
At that time check to see if the cuttings have grown their own roots. When that happens, gently separate each cutting, and pot on into individual 9cm pots. Pot them up using a general-purpose compost and let them grow on until ready to plant in the flower border, usually the following year.