Smooth Penstemon (Penstemon digitalis). Hardy, North American perennialDescription: White, tubular, 5-lobed flowers with thin purple lines to guide pollinators cluster on spires in mid-late spring; leaves are elliptical at base, becoming lance-shaped further up stem. Habit: Grows 3-5 feet high and up to 2 feet wide; flowers on erect, rigid stems; clump-forming.Culture: Prefers full sun to light shade and moist to dry, well-drained soil; drought tolerant.Hardiness: Cold hardy to USDA Zone 3Origin: Eastern... - Smooth Penstemon (Penstemon digitalis).
Smooth Aster (Symphyotrichum laeve). Hardy, autumn-flowering perennialDescription: Clusters of small, pale lavender flowers with yellow centers rise above a clump of smooth, bluish-green leavesHabit: Grows up to 4 feet tall with many flowers on each stalkCulture: Toler... - Smooth Aster (Symphyotrichum laeve).
Rusty Foxglove (Digitalis ferruginea). Summer-flowering perennial Description: Showy golden yellow-brown flowers with unusual rusty brown spotting and veining on the inside of the petals Habit: Flower stems grow to 5 feet high and 18 inches wide above its evergreen mound of dark green&com... - Rusty Foxglove (Digitalis ferruginea).
Purple Foxglove (Digitalis purpurea). Hardy biennial with spikes of tubular purple flowers Description: Spotted dark purple on the inside; flowers in late spring to early summer Habit: Flower stalks grow to 3-5 feet high; broad basal leaves spread 18 to 24 inches Culture: Prefers full s... - Purple Foxglove (Digitalis purpurea).
White Foxglove (Digitalis purpurea 'Alba'). Hardy biennialDescription: White, tubular flowers with small purple spots bloom in late spring to early summer. Habit: Flower stalks grow 4 to 6 feet and broad basal leaves spread 18 to 24 inchesCulture: Prefers sun to part shade and well-prepa... - White Foxglove (Digitalis purpurea 'Alba').
Small Yellow Foxglove (Digitalis lutea). Late-spring flowering perennialDescription: Tall, slender flower stems bear many charming, pale yellow, one-inch long flowersHabit: Flower stalks grow 2 to 3 feet tall above a basal mound of evergreen, strap-like, pale g... - Small Yellow Foxglove (Digitalis lutea).