Photo: Poyt448 Peter WoodardCC BY-SA 4.0via Wikimedia Commonsresized / cropped
Blechnum castaneum Plant Care
Blechnum contiguum Mett.
Updated · Sources · How we source care data
Lomaridium contiguum, synonym Blechnum contiguum, is a fern in the family Blechnaceae. The specific epithet refers to the contiguous lobes of the fronds.
Every 7–10 days
Bright indirect to low light
60–75°F
50–70%
At a glance
How do you care for Blechnum castaneum?
Water Blechnum castaneum every 7–10 days, letting the top layer of soil dry out between waterings, and give it bright indirect to low light. It prefers temperatures of 60–75°F (16–24°C) and 50–70% humidity. Fertilize it every 6 months during the growing season.
What Is the Blechnum castaneum?
Blechnum castaneum (Blechnum contiguum) belongs to the Blechnaceae family within the Blechnum genus. Blechnum castaneum is also known as Blechnum contiguum, Blechnum pseudovulcanicum, Lomaria contigua.
Blechnum castaneum displays a low rosette, spreading growth habit, reaching up to 1.5 ft tall with a spread of approximately 2 ft. Blechnum castaneum produces non-flowering.
Leaf size: approximately 12 inches.
How Often Should You Water a Blechnum castaneum?
Blechnum contiguum requires watering every 7–10 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 7–10 days
Let soil partially dry between waterings
What Light Does the Blechnum castaneum Need?
Blechnum castaneum thrives in bright indirect to low light. Avoid placing Blechnum castaneum in direct, harsh sunlight for extended periods, as this can scorch the foliage.
Light Requirement
Bright indirect to low light
What Temperature and Humidity Does the Blechnum castaneum Prefer?
Blechnum contiguum grows best at temperatures of 60–75°F. Blechnum castaneum prefers humidity levels of 50–70%. A pebble tray or humidifier helps maintain adequate moisture around the plant.
Temperature
60–75°F
Humidity
50–70%
What Soil Mix Works Best for a Blechnum castaneum?
Rich, well-draining soil with high organic content. Good drainage is essential for Blechnum castaneum to prevent waterlogging, which leads to root rot and fungal issues.
How Often Should You Fertilize a Blechnum castaneum?
Feed Blechnum castaneum every 6 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 6 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 Blechnum castaneum?
Repot every 2-3 years in spring. 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 Blechnum castaneum?
Blechnum castaneum can be propagated through spores, division of rhizomes. Similar propagation techniques also apply to hard fern plant care, which shares the same genus.
Is the Blechnum castaneum Toxic to Pets and Children?
Pet safety not verified
The ASPCA does not list Blechnum castaneum, 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 Blechnum castaneum?
Blechnum castaneum is susceptible to mealybugs, scale insects. 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 Blechnum castaneum Need?
Blechnum castaneum grows outdoors in USDA Zone 11b – 12b. It survives winters down to planting zone 11b. In cooler regions, grow Blechnum castaneum as a houseplant or bring it indoors before the first frost.
Hardiness Zone
Zone 11b – 12b
Keep exploring plants
Blechnum castaneum 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 Blechnum genus — compare its care with other Blechnum species on PlantoScan.
Blechnum is part of the Blechnaceae plant family — browse all Blechnaceae genera and species.
Blechnum castaneum copes with lower light than most plants — browse the full list of low-light plants.
More Blechnum Species
Other Blechnum species in PlantoScan's care catalogue share similar watering, light, and soil preferences:
Sources
- Scientific name & taxonomy: Blechnum contiguum Mett., family Blechnaceae (first published in Ann. Sci. Nat., Bot. sér. 4, 15: 70. 1861) — World Flora Online record, IPNI name record.
- Pet toxicity: Pet safety not verified: the ASPCA does not list Blechnum castaneum, 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.
- Photo: Poyt448 Peter Woodard, CC BY-SA 4.0, Wikimedia Commons — original.
- Hardiness zone: USDA Zone 11b – 12b, estimated from the plant's typical growing conditions.
- 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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