Mertensia asiatica is a perennial member of the borage family that produces salverform (trumpet-shaped) flowers from pink-tinged buds. The blooms are typically blue but can occasionally be white, and they appear from April to June. Plants belong to the genus Mertensia and are native to Asia.

Mertensia asiatica produces pink-tinged buds that open to blue or white salverform flowers from April to June.

Mertensia is a genus of flowering plants in the borage family Boraginaceae. They are perennial herbaceous plants with blue or sometimes white flowers that open from pink-tinged buds.

Mertensia asiatica

Bluebell | Mertensia asiatica

Mertensia ciliata is a perennial herb in the borage family that bears clusters of pendent bell-shaped flowers which open blue and age to pink‑red. Stems reach around 0.8 m and the plant flowers from April to June. It is native to western North America and occurs where soils remain moist to wet.

Mountain bluebell Mertensia ciliata flowers April to June on moist to wet soils in full sun and reaches about 0.8 m tall.

https://en.wikipedia.org/wiki/Mertensia_ciliata

Mertensia ciliata

Mountain bluebell | Mertensia ciliata

A perennial in the Boraginaceae, Mertensia ciliata 'Blue Drop' bears nodding bell-shaped blue flowers that age to pink-red and open in spring. It reaches about 0.8 m and flowers from April to June. Best grown in full sun in soils that range from sandy to clay provided they remain moist or wet and are well drained. Fully hardy (H7; USDA 4–8), it suits damp positions where early summer colour is required.

Mertensia ciliata 'Blue Drop' produces blue bell-shaped flowers that age to pink-red and blooms April to June in moist, sunny sites.

Mertensia ciliata 'Blue Drop'

Mountain Bluebell | Mertensia ciliata 'Blue Drop'

Mertensia maritima is a perennial herb in the Boraginaceae that gives off a mild, oyster-like scent. It forms a low plant to about 0.2 m and flowers from April to June. The species is native to the Northern Hemisphere and is fully hardy in the UK (H7).

Oysterplant (Mertensia maritima) is a fully hardy perennial that flowers April to June and favours full sun on sandy, well-drained soil.

https://en.wikipedia.org/wiki/Mertensia_maritima

Mertensia maritima

Oysterplant | Mertensia maritima

Mertensia paniculata is a shrub notable for its nodding, bell-shaped blue flowers produced in spring. It typically reaches about 0.8 m and originates from northwestern North America and the Great Lakes region. Plants produce their main display from April to June. It prefers moist to wet soils and a sunny position.

Lake Superior bluebell (Mertensia paniculata) flowers April to June and favours moist, well-drained to damp soils in full sun.

https://en.wikipedia.org/wiki/Mertensia_paniculata

Mertensia paniculata

Lake Superior bluebell | Mertensia paniculata

Mertensia virginica is a perennial herbaceous member of the borage family that produces nodding, bell-shaped flowers in spring. The blooms open pale blue from pink-tinged buds and appear from April to June. Grey-green leaves are carried on arching stems and suit shaded, sheltered spots. It is native to eastern North America and is often planted to naturalise in woodland ground cover.

Virginian bluebells (Mertensia virginica) produce pale blue, bell-shaped flowers from April to June and suit moist, acidic to neutral loamy soil in shade.

https://en.wikipedia.org/wiki/Mertensia_virginica

Mertensia virginica

Virginian bluebells | Mertensia virginica

Mertensia virginica 'Rubra' is a perennial in the borage family that produces spring flowers from April to June. Native to Ontario and Quebec, it favours moist, rich, loamy soil with a neutral to slightly acidic reaction. Grow in partial to full shade on a north or east aspect in a sheltered spot. It is suited to woodland and shade gardens and to naturalising in suitable sites.

Red Virginia Bluebells (Mertensia virginica 'Rubra') flower April to June and suit moist, neutral to slightly acidic loam in partial to full shade.