Description
Mertensia –
There are about 50 species of clump forming, mound forming, or prostrate perennials in this genus. They occur from wet meadows, woodlands, and coasts in Europe, Asia, North America, and Greenland. They have hairy alternate, lance shaped to rounded leaves, sometimes with heart shaped bases, are light to dark green or grayish or bluish green. Pendent, tubular or bell shaped, 5 lobed blue flowers, with flared, funnel shaped mouths, are bourne in terminal or axillary cymes. Grow the smaller species in a gravel bed, rock garden, the larger ones in a herbaceous border or woodland garden.
Grow in moist but well drained, humus rich soil in light, dapples shade. Divide clumps carefully as new growth begins in spring.
Prone to slugs and snails, powdery mildew, rust, and leaf smut.
M. sibirica – This clump forming perennial from Eastern Siberia and Eastern Asia grows 24″ tall and 12″ wide. It produces broadly elliptic, broadly ovate, or heart shaped, light green basal leaves, 2-4″ long. The erect, unbranched, hairless, light green stems bear more oval, pointed leaves. From late spring to mid summer, terminal cymes of flared, tubular, deep blue or purple blue flowers, to ½” long, are borne on long, axillary flower stalks.
Zones 3-7
