A giant version of the common evergreen ground cover perennial with large bronze-purple leaves and spikes of deep blue flowers that emerge in pring and last throughout the summer. Photo provided by: Howard Nurseries Ltd...

A beautiful variety with deeply divided leaves and elegant fully double, duck egg blue flowers on wirey stems. Cut back after flowering to encourage a second flush in late summer. Photo provided by: Barnes Nurseries...

A lovely Heuchera whose emerging leaves have red veining that lightens with age. Chartreuse yellow leaves mature to apple green. Photo provided by: Barnes Nurseries...

An old cottage garden plant often seen growing on walls and dry, stony banks. Attractive fragrant white flowers above bright green leaves. Photo provided by: Jelitto Staudensamen GMBH...

A strong, compact, mounding perennial with light green foliage topped with tubular orange petals surrounding a large burgundy eye. Photo provided by: Ball Colegrave...