Dwarf Bristle-moss Plant Care
Tortula acaulon (With.) R.H.Zander
Updated · Sources · How we source care data
Tortula acaulon, formerly Phascum cuspidatum, the cuspidate earth-moss or toothed phascum moss, is a moss with 3 mm leaves which forms green patches. It is very common and has a number of varieties in a wide range of habitats.
Every 3–5 days
Partial to full shade
50–75°F
40–70%
At a glance
How do you care for Dwarf Bristle-moss?
Water Dwarf Bristle-moss every 3–5 days, letting the top layer of soil dry out between waterings, and give it partial to full shade. It prefers temperatures of 50–75°F (10–24°C) and 40–70% humidity. Fertilize it every 8 months during the growing season.
What Is the Dwarf Bristle-moss?
Dwarf Bristle-moss (Tortula acaulon) belongs to the Pottiaceae family within the Tortula genus.
Dwarf Bristle-moss displays a low mat-forming growth habit, reaching up to 0.1 ft tall with a spread of approximately 0.5 ft. Dwarf Bristle-moss produces small, inconspicuous flowers.
Leaf size: approximately 0.2 inches.
How Often Should You Water a Dwarf Bristle-moss?
Tortula acaulon requires watering every 3–5 days. Allow the top layer of soil to dry between waterings to prevent root rot. Reduce watering frequency during winter when growth slows.
Watering Frequency
Every 3–5 days
Let soil partially dry between waterings
What Light Does the Dwarf Bristle-moss Need?
Dwarf Bristle-moss thrives in partial to full shade. The optimal light range is 50–200 lux. Avoid placing Dwarf Bristle-moss in direct, harsh sunlight for extended periods, as this can scorch the foliage.
Light Requirement
Partial to full shade
50–200 lux
What Temperature and Humidity Does the Dwarf Bristle-moss Prefer?
Tortula acaulon grows best at temperatures of 50–75°F. Dwarf Bristle-moss prefers humidity levels of 40–70%.
Temperature
50–75°F
Humidity
40–70%
What Soil Mix Works Best for a Dwarf Bristle-moss?
Well-draining sandy soil with good aeration. Good drainage is essential for Dwarf Bristle-moss to prevent waterlogging, which leads to root rot and fungal issues.
How Often Should You Fertilize a Dwarf Bristle-moss?
Feed Dwarf Bristle-moss every 8 months during the growing season (spring and summer) with a balanced fertilizer diluted to the strength on the label.
Pause feeding in autumn and winter, when growth slows, and never fertilize dry soil — water first.
Fertilizing
Every 8 months
During the growing season
The PlantoScan app can remind you when to water and when to fertilize each plant.
How Do You Repot a Dwarf Bristle-moss?
Repot every 1-2 years. Choose a pot one size larger than the current container, and ensure it has drainage holes to allow excess water to escape.
How Do You Propagate a Dwarf Bristle-moss?
Dwarf Bristle-moss can be propagated through spores, division. Similar propagation techniques also apply to tortula cernua plant care, which shares the same genus.
Is the Dwarf Bristle-moss Toxic to Pets and Children?
Pet safety not verified
The ASPCA does not list Dwarf Bristle-moss, so we can't confirm whether it is safe for cats and dogs. Keep pets from chewing it as a precaution.
This is a general caution, not veterinary or medical advice. If your pet ate a plant, contact your vet or animal poison control.
See all plants toxic to cats and plants toxic to dogs.
What Pests and Diseases Affect the Dwarf Bristle-moss?
Dwarf Bristle-moss is susceptible to occasional issues with mites and aphids. Inspect the foliage regularly, especially along leaf undersides and stems. Treat infestations promptly with insecticidal soap or neem oil to prevent spread.
Yellow leaves, brown tips or drooping? See common plant problems and how to fix them.
What USDA Hardiness Zone Does the Dwarf Bristle-moss Need?
Dwarf Bristle-moss grows outdoors in USDA Zone 12a. It survives winters down to planting zone 12a. In cooler regions, grow Dwarf Bristle-moss as a houseplant or bring it indoors before the first frost.
Hardiness Zone
Zone 12a
Keep exploring plants
Dwarf Bristle-moss is one of many species covered in the complete plant care and identification guide, which groups plants by genus, attribute, and popularity.
It belongs to the Tortula genus — compare its care with other Tortula species on PlantoScan.
Tortula is part of the Pottiaceae plant family — browse all Pottiaceae genera and species.
Dwarf Bristle-moss copes with lower light than most plants — browse the full list of low-light plants.
Related Plant Care Guides
Closely related plants with similar care requirements:
Sources
- Scientific name & taxonomy: Tortula acaulon (With.) R.H.Zander, family Pottiaceae (first published in Bull. Buffalo Soc. Nat. Sci. 32: 378 1993) — World Flora Online record.
- Pet toxicity: Pet safety not verified: the ASPCA does not list Dwarf Bristle-moss, so we can't confirm whether it is safe for cats and dogs. Checked against the ASPCA plant list; any other toxicity note on this page comes from PlantoScan's plant database.
- Hardiness zone: USDA Zone 12a, calculated from the plant's minimum temperature.
- Care values(watering, light, temperature, humidity, soil, fertilizing): PlantoScan's plant database, filtered by automatic plausibility checks — values that fail them are hidden. How we source and check plant data.
Spotted a mistake? Email info@upvision.media with the page link — we check and correct reported errors.
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