Polytrichum juniperinum

Juniper Haircap Moss, Juniper Polytrichum Moss, Juniper Haircap

Easy careTerrestrialNon-toxic2–20 cm

A hardy moss found on every continent, including Antarctica. It forms dense, cushion-like tufts of reddish stems topped with grey-green, lance-shaped leaves that end in red-brown tips. Notably drought-tolerant for a moss, it does well on dry acidic soils and exposed banks. That toughness makes it one of the more versatile mosses for terrarium culture, working in both open and closed setups.

Build a terrarium with this plant

Care

Prefers medium humidity, indirect light, with -5–25 °C, and reaches 20 cm at maturity.

Light

Indirect light(preferred)Shade tolerantBright indirect

Humidity

Medium (40–60%)(preferred)High (60–80%)Low (30–40%)

Temperature

-10°C15°C40°C

-5°C – 25°C

Soil

Sandy(preferred)Well drainingLoamy

Moisture

Moist(preferred)Dry

Soil pH

3.5 – 6.5

Propagation

Divide established clumps with clean tools and press onto moist substrate. This is the fastest and most reliable method.

Native range

Native to Northern Europe, Middle Europe, Southwestern Europe, Southeastern Europe, Eastern Europe, Northern Africa, Macaronesia, Northern South America, Siberia, Russian Far East, Caucasus, Western Asia, China, Eastern Asia, Indian Subcontinent, Australia, New Zealand, Subarctic America, Western Canada, Eastern Canada, Northwestern U.S.A., North-Central U.S.A., Northeastern U.S.A., Southwestern U.S.A., South-Central U.S.A., Southeastern U.S.A., Mexico, Western South America, Brazil, Southern South America, and Sub-Antarctic Islands.

Appearance

Growth habit

UprightClumping

Leaf shape

Lance

Leaf texture

Fine

Frequently asked

Can Juniper Haircap Moss grow in a closed terrarium?

Juniper Haircap Moss 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 Juniper Haircap Moss need drainage?

Juniper Haircap Moss prefers a moist substrate. Drainage is helpful but not critical; consistent moisture matters more.

What humidity does Juniper Haircap Moss need?

Juniper Haircap Moss does best in medium (40–60%) humidity.

Is Juniper Haircap Moss pet-safe?

Juniper Haircap Moss is considered non-toxic to common household pets.

How tall does Juniper Haircap Moss grow?

Juniper Haircap Moss typically reaches 2–20 cm at maturity.

How do you propagate Juniper Haircap Moss?

Juniper Haircap Moss can be propagated by division or spores.

References

1
GBIF — Polytrichum juniperinum Hedw.
https://www.gbif.org/species/2683092
2
PFAF — Polytrichum juniperinum
https://pfaf.org/User/Plant.aspx?LatinName=Polytrichum+juniperinum
3
Terrarium Creations — P. juniperinum Care Guide
https://terrariumcreations.com/polytrichum-juniperinum-moss-in-terrariums-care-guide-to-help-your-moss-thrive/
4
Botanikks — Polytrichum juniperinum
https://www.botanikks.com/plants/polytrichum-juniperinum/589033/1
5
British Bryological Society — Species Finder
https://www.britishbryologicalsociety.org.uk/learning/species-finder/polytrichum-juniperinum/
6
US Forest Service FEIS — Polytrichum juniperinum
https://www.fs.usda.gov/database/feis/plants/bryophyte/poljun/all.html