Salvia nemorosa 'Blue Hill'
Common Name: Salvia-Perennial, garden sage, wood sage;
a/k/a Salvia x superba 'Blue Mound' and x sylvestris 'Blauhugel'.
Zones 3 to 8.
Plants reach 16 to 18 inches tall and 15 to 18 inches wide;
Growth rate: Moderate, clump forming herbaceous perennial.
The tall, spike-like racemes flowers of 'Blue Hill' are the closest to true blue of any hardy Salvia available. This compact Salvia has narrow, dark green, basal leaves and is very long-flowering. A mint family member, its foliage is aromatic when crushed.