Plagiothecium undulatum

Waved Silk Moss, Waved Silk-moss, Wavy-leaved Cotton Moss

Moderate careTerrestrialNon-toxic3–8 cm

A large moss with wavy, transversely ridged leaves and an unusual whitish to pale green colour that stands out against darker species. It is pleurocarpous, meaning it branches and spreads sideways rather than growing strictly upright. Native across Europe, Asia, and North America, it does best on acidic substrates in shaded, woodland-like conditions. Its silky texture and high humidity needs make it well suited to closed terrariums.

Build a terrarium with this plant
Waved Silk Moss image

Care

Prefers high humidity, low light, with 0–22 °C, and reaches 8 cm at maturity.

Light

Shade tolerant(preferred)Indirect light

Humidity

High (60–80%)(preferred)Very high (80%+)

Temperature

0°C20°C40°C
0°C – 22°C

Soil

Peat moss(preferred)Moisture retentiveSphagnum mix

Moisture

Moist(preferred)Wet

Soil pH

4 – 6

Propagation

Divide established mats into smaller clumps and place on acidic, moist substrate in shade. It settles in well when humidity stays high.

Frequently asked

Can Waved Silk Moss grow in a closed terrarium?

Yes. Waved Silk Moss prefers high (60–80%) humidity, which is what a closed terrarium provides, and tolerates shade-tolerant conditions.

Does Waved Silk Moss need drainage?

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

What humidity does Waved Silk Moss need?

Waved Silk Moss does best in high (60–80%) humidity.

Is Waved Silk Moss pet-safe?

Waved Silk Moss is considered non-toxic to common household pets.

How tall does Waved Silk Moss grow?

Waved Silk Moss typically reaches 3–8 cm at maturity.

How do you propagate Waved Silk Moss?

Waved Silk Moss can be propagated by division.

References

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    GBIF - Plagiothecium undulatum

    https://www.gbif.org/species/5710930
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    Plagiotheciaceae in Eurasia - PMC

    https://pmc.ncbi.nlm.nih.gov/articles/PMC8145931/
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