Gentians are prized for their tubular flowers in intense blue shades. Many are considered difficult to grow, but G. asclepiadea needs little more than consistent moisture and humus-rich soil with excellent drainage. Some require lime-free soil, as noted. Well worth the extra care, as they produce some of the richest blues in the garden.
From Turkey and Iran to central Asia. Arching or sprawling stems 9–18 in. long form a spreading leafy mass about 8 in. high and 1 ft. wide. Clusters of 2-in., dark purplish blue flowers appear in late summer. G. s. lagodechiana, the form commonly sold, is similar but has more widely spaced flowers.
Grows to 2–3 ft. tall, 6 ft. wide. Macedonian native; considered the hardiest common boxwood.
To 2 ft. Dwarf with tiny leaves that emerge bluish, take on rust tones. Blue-purple flowers in early m...
Native to Japan. Grows to 4 ft. tall and 2 ft. wide, with grayish green leaves and pink flower spikes ...