Schistidium maritimum

Seaside Grimmia, Sea Schistidium

Expert careLithophyteNon-toxic1–5 cm

A compact, cushion-forming moss that grows on coastal rocks just above the high-water line, enduring constant salt spray. It is one of the very few mosses classified as a halophyte, meaning it can tolerate saline conditions. It forms neat olive-green to dark green tufts in cracks and crevices of seaside rock faces across Atlantic Europe. In cultivation it grows well without salt water, making it an unusual candidate for open terrariums or vivaria simulating rocky coastal habitats.

Build a terrarium with this plant
Seaside Grimmia image

Care

Prefers medium humidity, bright indirect light, with 2–22 °C, and reaches 5 cm at maturity.

Light

Bright indirect(preferred)Indirect light

Humidity

Medium (40–60%)(preferred)High (60–80%)

Temperature

0°C20°C40°C
2°C – 22°C

Soil

Rocky(preferred)

Moisture

Moist(preferred)Dry

Propagation

Carefully separate small cushions from the rock substrate, keeping as much of the base intact as possible. Place on damp rock or mineral substrate with moderate humidity and good airflow.

Native range

Native to Northern Europe and Southwestern Europe.

Appearance

Growth habit

Clumping

Leaf shape

Lance

Leaf texture

Rough

Frequently asked

Can Seaside Grimmia grow in a closed terrarium?

Seaside Grimmia prefers medium (40–60%) humidity, which is below the level a closed terrarium typically maintains. It is better suited to an open terrarium or houseplant setup.

Does Seaside Grimmia need drainage?

Seaside Grimmia prefers a moist substrate. Drainage is helpful but not critical; consistent moisture matters more.

What humidity does Seaside Grimmia need?

Seaside Grimmia does best in medium (40–60%) humidity.

Is Seaside Grimmia pet-safe?

Seaside Grimmia is considered non-toxic to common household pets.

How tall does Seaside Grimmia grow?

Seaside Grimmia typically reaches 1–5 cm at maturity.

How do you propagate Seaside Grimmia?

Seaside Grimmia can be propagated by division.

References

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