“March is the time to lift and divide overgrown clumps of summer-flowering perennials, as they’re just coming into growth. Lift the old clump with a fork, and then prise apart with a couple of forks back to back. Discard the old ‘centre’ of the clump, and replace with the younger clumps from around the edge.
Other pieces can either be planted straightaway – make sure to plant in odd-numbered groups for a more ‘natural’ effect – or they can be potted-up. Give the replanted pieces a good watering, and mulch them with compost to refresh the soil. A great way to rejuvenate your borders”.