Mossy rockweed Plant Care
Porothamnium fasciculatum (Sw. ex Hedw.) M.Fleisch.
Updated · Sources · How we source care data
With its unique cylindrical capsules that grow in clusters along the stems, Porothamnium fasciculatum is a fascinating moss native to the western United States. Plant collectors are drawn to this species for its unusual reproductive structures, adding a touch of curiosity to their botanical collections.
Every 5–7 days
Low to medium indirect light
50–70°F
40–60%
At a glance
How do you care for Mossy rockweed?
Water Mossy rockweed every 5–7 days, letting the top layer of soil dry out between waterings, and give it low to medium indirect light. It prefers temperatures of 50–70°F (10–21°C) and 40–60% humidity. Fertilize it every month during the growing season.
What Is the Mossy rockweed?
Mossy rockweed (Porothamnium fasciculatum) belongs to the Neckeraceae family within the Porothamnium genus. Mossy rockweed is native to North America. Mossy rockweed is also known as Clustered porothamnium.
Mossy rockweed displays a low mat-forming ground cover growth habit, reaching up to tall with a spread of approximately 1 ft. Mossy rockweed produces tiny inconspicuous flowers.
How Often Should You Water a Mossy rockweed?
Porothamnium fasciculatum requires watering every 5–7 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 5–7 days
Let soil partially dry between waterings
What Light Does the Mossy rockweed Need?
Mossy rockweed thrives in low to medium indirect light. Avoid placing Mossy rockweed in direct, harsh sunlight for extended periods, as this can scorch the foliage.
Light Requirement
Low to medium indirect light
What Temperature and Humidity Does the Mossy rockweed Prefer?
Porothamnium fasciculatum grows best at temperatures of 50–70°F. Mossy rockweed prefers humidity levels of 40–60%.
Temperature
50–70°F
Humidity
40–60%
What Soil Mix Works Best for a Mossy rockweed?
Well-draining peat-based soil mix with added perlite for aeration. Good drainage is essential for Mossy rockweed to prevent waterlogging, which leads to root rot and fungal issues.
How Often Should You Fertilize a Mossy rockweed?
Feed Mossy rockweed every month 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 month
During the growing season
The PlantoScan app can remind you when to water and when to fertilize each plant.
How Do You Repot a Mossy rockweed?
Replant every 1-2 years to refresh soil and prevent overcrowding. 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 Mossy rockweed?
Mossy rockweed can be propagated through spores, division of rhizomes. Similar propagation techniques also apply to filamentous moss plant care, which shares the same genus.
Is the Mossy rockweed Toxic to Pets and Children?
Pet safety not verified
The ASPCA does not list Mossy rockweed, 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 Mossy rockweed?
Mossy rockweed is susceptible to fungal diseases such as powdery mildew. 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.
Keep exploring plants
Mossy rockweed 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 Porothamnium genus — compare its care with other Porothamnium species on PlantoScan.
Porothamnium is part of the Neckeraceae plant family — browse all Neckeraceae genera and species.
Mossy rockweed 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: Porothamnium fasciculatum (Sw. ex Hedw.) M.Fleisch., family Neckeraceae (first published in Musci Buitenzorg 3: 927 1908) — World Flora Online record.
- Pet toxicity: Pet safety not verified: the ASPCA does not list Mossy rockweed, 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.
- 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.
Identify Plants Like the
Mossy rockweed Instantly
Scan any plant with your phone camera and get instant ID, care tips, water and fertilizer reminders, and health checks — all in one app.
Free
to download
iOS & Android
platforms
Light & dark
mode
100,000+
species