Even the best-planned beds and borders can seem a little empty after the spring peak, but including a few cheerful, quick-growing plants will soon fill them out in time for summer. In Warwickshire, the double herbaceous borders are a highlight of the Carolean Garden at National Trust-owned Packwood House, repeat planting and contrasting colours contributing to their vibrancy.
Their success is partly due to Robyn Booth, who arrived
