How to... take root cuttings

Taking root cuttings is a simple way to propagate plants but is a much-neglected technique.

You don't have to dig up your plant to take root cuttings - just gently dig up some of the soil alongside to find suitable roots. Cut roots as close to the crown of the plant as you can and remove them carefully from the soil.

It's vital to keep the roots the right way up - one trick is to cut a straight, flat cut on the end that was closest to the plant, and a slanted cut on the other end. Cut each cutting to 5-10cm/2-4in long.

Fill a pot with compost mixed with grit, then push in the cuttings around the edge so the topmost cut surface is flush with the top of the compost, then cover with sharp grit, which will retain moisture yet drain water from the top of the cutting, preventing rot. Water the cuttings well and cover with a clear plastic bag secured with an elastic band. After a few weeks, remove the bag, and once plants are strong and self-sufficient, plant out. Herbaceous plants such as acanthus, phlox and verbascum are easily propagated this time of year.

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