This section is from the book "The Gardener's Monthly And Horticulturist V20", by Thomas Meehan. See also: Four-Season Harvest: Organic Vegetables from Your Home Garden All Year Long.
This is one of the finest hardy species of Pentstemon, and is yet very rare in cultivation. The flowers are among the largest of the genus and are produced in loose spikes of 8 to 12 inches in length, broadly bell-shaped and two inches or more long, of a purplish white, and remain for some days. The plant is hardy and vigorous, and improves with careful cultivation. It cannot fail to become one of the finest of the many hardy herbaceous perennials just now becoming so popular in Europe and America. - J. M. Thorburn.