The earliest soft green shoots of herbaceous campanulas make fast-rooting cuttings, known as basal cuttings.
Taken from below soil level, some have roots already, which helps them grow quickly. As well as campanulas, you can also use this technique on chrysanthemums, asters, delphiniums, dahlias and heleniums.
Once potted, the cuttings will root in the greenhouse or cold frame with no extra heat, although a propagator will speed things up.
Several cuttings around the edge of a pot can make an instant clump for planting by June, or pot them on as singles for planting next year.
Discover how to propagate campanulas by taking basal cuttings, below.