Gentians are prized for their tubular flowers in intense blue shades. Many are considered difficult to grow, but the following need little more than consistent moisture and humus-rich soil with excellent drainage. Some require lime-free soil, as noted. Well worth extra care, as they produce some of the richest blues in the garden.Gentiana asclepiadea
Native to Europe andwestern Asia. Arching, large-leafed stems form a clump 2–3 ft. high and 1 1/2 ft. wide. In late summer and early fall, rich, deep blue, 1 1/2-in., trumpet-shaped flowers open into stars atop the stems and among theupper leaves. Thrives in rich, neutral to acidic soil; makes a choice companion for ferns.Partial shade.
Native to Russia, northern China. Grows 50 ft. tall, 40 ft. wide. Smooth dark green leaves are 3/4 to ...
Yellow-striped foliage in clumps to 4 ft. tall, 5 ft. wide, with silvery white flower plumes to 6 ft. ...
Produces 6–9-in., single to semidouble, golden yellow flowers on 2-2 1/2 ft high plants.