thegardengeeks
Plant Guide

Mertensia maritima


Pronunciation: mer-TEN-see-ah mah-RIT-ih-mah
Family: Boraginaceae
Common Name: Oysterleaf, Oyster Plant
Plant Type:
  • perennial

Height to: 4"
Width to: 12"
USDA Hardiness Zones:
  • -30 to -40ºF ZONE 3
  • -20 to -30ºF ZONE 4
  • -10 to -20ºF ZONE 5
  • 0 to -10ºF ZONE 6
  • 10 to 0ºF ZONE 7

Pests and Diseases: slugs and snails, powdery mildew, rust, leaf smut

Propagation: sow seed in containers in cold frame in autumn; keep young plants ahded and do not allow the soil to dry out. Divide clumps carefully as new growth begins in the spring.
Native to: Coasts of E. North America, Greenland, N. Europe
Notes:

Blue-green ovate leaves are formed on flowering stems emanating from a modest rosette of leaves. Stems lie close to the ground in 15-inch mounds, and from spring to early summer bear small bluebell-like flowers in the leaf axils. The foliage is the more important feature of this plant.

Plant Type: perennial

Plant Form or Habit: low and trailing

Plant Use: Rock garden, front of the border, along foundation plantings.

 

Light Requirement: full sun

 

Flower Color:
light blue
Bloom Period:
late spring
early summer
mid-summer
Height: Minimum: 2 inches      Maximum: 4 inches

Width: Minimum: 4 inches     Maximum: 8 inches

Foliage Texture: coarse

USDA Hardiness Zone: 4

Water Requirements: low

Additional Comments: Prefers well-drained soil. Sow seed in spring; divide in fall. Root cuttings planted in fall may be transplanted in spring. Susceptible to slug damage. Our planting bloomed from June into August. Seed obtained from Jelitto.

Source: Texas A&M


USDA Heat Zones (days above 86ºF):
  • Less then 1 day ZONE 1
  • 1 to 7 days ZONE 2
  • 7 to 14 days ZONE 3
  • 14 to 30 days ZONE 4
  • 30 to 45 days ZONE 5
  • 45 to 60 days ZONE 6
  • 60 to 90 days ZONE 7

Submitted by: Pectiwiccan
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