Light
Bright indirect • approx. 10,000–20,000 lux
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Polypodiaceae
Microsorum thailandicum
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- Representative photos:
Product images show a typical plant of this variety. Natural differences in leaf number, shape or variegation are normal, your plant will still match in type and quality.
- Size details:
Listed sizes refer to pot diameter (cm) and approximate overall height (cm) from the base of the pot to the tallest leaf or stem.
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Your new plant has just travelled a long way and needs a calm start in its new home. For step-by-step unboxing and first-week care, check our after-delivery care guide. For deeper tips on how your plant settles in over the next weeks, read our houseplant acclimatization guide.
- Care basics , Main hub with links to all houseplant care guides.
- After delivery & first week , Unpacking, first placement, and early recovery.
- Light, How much light houseplants really need indoors.
- Watering , When to water and how to avoid root rot.
- Substrates & roots, Potting mixes and drainage for strong root systems.
- Humidity, When humidity matters and what actually helps.
- Fertilizing, Simple feeding routine without burning roots.
- Problems & pests, Yellow leaves, brown tips, bugs, and fixes that work.
- Semi-hydro, How to run low-maintenance mineral substrates.
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Microsorum thailandicum
Quick Care Guide
Watering
Water when ~0–10% dry
Substrate
Moisture-retentive but aerated • Evenly moist • Organic-leaning • Fine-medium
Temperature
Ideal: 18–24 °C • Avoid below: 15 °C
Humidity
Humid 60–80 % +
Growth habit
Creeping epiphytic fern.
Support
not needed
Growth speed
Average
Max size indoors
Max. height: 30 cm • Max. spread: 30 cm
Toxicity & safety
Non-toxic
Origin & habitat
Native to Peninsula Thailand
Outdoor growing
Outside from 12 °C · sheltered from wind
How to read these values
These care values are quick reference points for indoor growing. Use them as a guide, then adjust for pot size, substrate, temperature and how quickly the substrate dries.
For more detail, read the full product description or visit our Plant Care Guides.
- Light: level and approximate lux at leaf level.
- Watering: “% dry” shows how far the substrate should dry before watering again.
- Substrate: structure, drainage, moisture retention, base material and particle size.
- Temperature: “Ideal” shows the preferred range; “Avoid below” marks the cold-stress threshold.
- Humidity: target range; steady conditions usually matter more than exact numbers.
- Growth habit: how the plant grows, such as upright, climbing, trailing, clumping or rosette-forming.
- Support: whether a stake, pole or trellis is needed, optional or unnecessary.
- Growth speed: expected pace under suitable indoor conditions; use as a guide, not a promise.
- Max size indoors: realistic long-term indoor size under good conditions.
- Toxicity & safety: irritation, toxicity or physical hazards such as spines or bristles.
- Origin & habitat: native range, hybrid background or typical habitat where relevant.
- Outdoor growing: when a potted indoor plant can be placed outside and what outdoor protection it needs.
Microsorum thailandicum: The Iridescent Blue Oil Fern
Microsorum thailandicum Boonkerd and Noot, commonly known as the Blue Oil Fern, is an epiphytic fern renowned for its stunning, iridescent foliage. The leathery, strap-like fronds exhibit a metallic blue sheen on the upper surface, while the underside displays a dull bluish-green hue. Sporangia are borne on the upper quarter to third of the frond's underside, adding to its unique appearance.
Unique Characteristics of Microsorum thailandicum
- Iridescent Foliage: The metallic blue leaves shift in color under different lighting, giving the fern a mesmerizing effect.
- Epiphytic Growth: Grows naturally on trees or rocks, absorbing moisture and nutrients from the air and surrounding environment.
- Compact and Manageable: Unlike many ferns, this species stays relatively small, making it ideal for terrariums, vivariums, or indoor plant collections.
What You Need to Know About Microsorum thailandicum
- Natural Habitat: Native to Thailand, where it thrives in humid, shaded forest environments.
- Growth Habit and Size: Grows as a slow-spreading epiphyte, with fronds reaching up to 30 cm in length.
- Toxicity: Considered non-toxic to humans and pets, making it a safe choice for homes with animals.
- Lifecycle: A long-living perennial fern that can thrive for years under proper conditions.
How to Care for Microsorum thailandicum
- Light: Prefers bright, indirect light or dappled shade. Too much direct sun can cause leaf damage.
- Watering: Keep the substrate consistently moist but not waterlogged. Avoid letting it dry out completely.
- Humidity: Requires high humidity (70%+). Ideal for terrariums, greenhouses, or humid indoor spaces.
- Temperature: Best grown in temperatures between 18°C and 27°C. Avoid exposure to cold drafts or sudden temperature drops.
- Soil: Prefers an airy, well-draining mix of sphagnum moss, orchid bark, and perlite for moisture retention without waterlogging.
- Repotting: Rarely needs repotting; refresh substrate every couple of years to maintain aeration and nutrients.
- Fertilization: Feed with diluted orchid fertilizer once a month during the growing season.
- Propagation: Can be propagated by rhizome division; ensure each section has at least one healthy frond.
- Semi-Hydroponics: Adaptable to semi-hydroponic setups if provided with high humidity and good air circulation.
- Pruning: Remove dead or damaged fronds to encourage fresh growth.
Common Problems and Solutions for Microsorum thailandicum
- Pests: Rarely affected by pests, but may occasionally attract spider mites in dry conditions. Increase humidity and rinse fronds with water if needed.
- Root Rot: Overwatering can lead to rhizome rot. Ensure the plant is in a well-draining medium and avoid standing water.
- Leaf Curling or Browning: Usually a sign of low humidity or excessive light. Adjust care conditions accordingly.
- Fungal Issues: Poor air circulation can lead to fungal infections. Ensure good ventilation and avoid overly wet conditions.
Additional Notes on Microsorum thailandicum
Due to its unique metallic-blue sheen, Microsorum thailandicum is often used in ornamental displays and exotic plant collections. The fern thrives in terrariums or enclosed environments where humidity remains consistently high. Regular misting and a well-maintained environment will ensure it flourishes.
Etymology of Microsorum thailandicum
The genus name Microsorum is derived from the Greek words "mikros" (meaning small) and "sorus" (referring to the spore-producing structures in ferns). The species name thailandicum reflects its origin in Thailand, where it was first documented.
Why Add Microsorum thailandicum to Your Collection?
With its mesmerizing blue iridescence and compact growth habit, Microsorum thailandicum is an extraordinary addition to any plant collection. Its adaptability to terrarium environments and humidity-loving nature make it a unique and rewarding fern to grow.
Plant names, growth habits, natural habitats and indoor care guidance are checked against trusted botanical, habitat and horticultural references before publication.View our plant care resources and references.
FAQs about Microsorum thailandicum
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