My garden is at present amazingly blue with Dropmore Alkanet (Anchusa).
"The Healthy Life, Vol. V, Nos. 24-28" by Various
Anchusa italica, 8; A. sempervirens, 9.
"Hardy Perennials and Old Fashioned Flowers" by John Wood
She gazed at the bushes of blue anchusa; the gardener had planted pink monthly roses a little too thickly among them.
"The Second Fiddle" by Phyllis Bottome