Microsorum pteropus 'Windelov' (Windelov Java fern) care

Light

If you have a corner where every other plant turned leggy and died, try microsorum pteropus 'windelov'. A low-light plant thriving at roughly 15-40 PAR; bright light burns the fine lacy tips and fuels algae. No direct sun. Shaded positions under taller plants show off its frilly fronds best. The catch: when a low-light plant does fail, it's almost always because someone watered it on the same schedule as their brighter plants. Less light = less water, every time.

Watering

Watering microsorum pteropus 'windelov': submerged aquatic; keep continuously underwater with a 25-30% water change weekly. The number that matters isn't the day of the week — it's how dry the top 2-3 cm of the pot feels. A finger in the soil tells you more than a watering app. After every watering, tip the saucer. A permanently submersed plant tolerant of a wide range (pH 6.0-7.5, soft to moderately hard) and undemanding about chemistry. Weekly partial water changes keep the lacy tips clean; it can also be grown emersed in very humid setups.

Soil and pot

Microsorum pteropus 'Windelov' grows best in none; epiphyte attached to wood or rock. Never bury the rhizome, it will rot. Tie or glue the rhizome to driftwood or stone and let the roots grip the surface while it feeds from the water column. A pot with a working drainage hole is non-negotiable for this species — even free-draining mix will turn soggy in a closed planter. If you love the look of a decorative pot without a hole, use it as a cachepot around an inner nursery pot you can lift out to water.

Humidity and temperature

Microsorum pteropus 'Windelov' sits happiest at around 100% (submerged) or near-saturated if emersed humidity and 20-28°C (68-82°F). Grown submerged, humidity is irrelevant. If grown emersed in a paludarium or terrarium it needs near-saturated humidity to keep the fine frond tips from drying out. If you keep the room above 20 year-round and avoid placing the plant near a cold draught, a hot radiator, or an air-conditioning vent, you have already handled the two biggest indoor stressors.

Fertilising

Feed microsorum pteropus 'windelov' sparingly. Feed entirely through the water column with a balanced liquid fertiliser; modest iron and potassium keeps the lacy fronds green. It grows slowly and needs no substrate feeding, so light dosing suffices. CO2 is optional and not required. Skip fertiliser entirely on a stressed, recently-repotted, or actively wilting plant — fertiliser salts make damage worse, not better. Wait for a round of healthy new growth before resuming a feeding rhythm.

Common problems

Below are the issues we see most often on microsorum pteropus 'windelov' in the Growli community. Each is annotated with the most common cause so you know where to start.

• Rhizome rot from burial — Buried in substrate, the rhizome rots and the plant dies. Attach it to wood or rock with the rhizome fully exposed to the water.
• Damaged lacy tips — The fine crested tips are fragile and brown under strong light or rough flow. Keep lighting low and flow gentle, and trim any browned tips.
• Java fern melt — Translucent, mushy fronds after stress or a move. Stabilise water quality, dose potassium, remove affected fronds, and the rhizome pushes healthy new lace growth.
• Algae on slow fronds — Slow growth lets algae settle on the intricate tips under excess light. Reduce the photoperiod, shade it, and add algae-grazing shrimp or snails.

Propagation

Propagates from adventitious plantlets that form on the frilly frond tips; once a plantlet has roots and a few fronds, detach it and attach to new hardscape. The rhizome can also be divided into sections, each bearing roots and fronds. Propagation is the cheapest, most satisfying way to expand a collection — and it doubles as insurance against losing a mature plant to an accident. Take a backup cutting once the parent is established and healthy.

Toxicity to pets

Microsorum pteropus 'Windelov' is mildly toxic to pets. This Java fern cultivar (Microsorum pteropus 'Windelov') is not individually listed by the ASPCA. Although most true ferns are non-toxic, the species is unverified, so treat with caution and verify with a vet rather than assuming pet-safe. Exposure is minimal as a submerged aquatic anyway. If you keep cats, dogs, or curious children in the house, weigh placement carefully — a high shelf or a hanging planter is enough for casual safety. For severe ingestion incidents, call your local vet and the ASPCA Animal Poison Control Center (in the US, 888-426-4435).

Pet-safety status is sourced from the ASPCA Toxic and Non-Toxic Plant List, which catalogues the most-asked-about plants for cats, dogs, and horses.

Microsorum pteropus 'Windelov' deep-dive guides

Every aspect of microsorum pteropus 'windelov' care, each with its own calibrated guide:

• Microsorum pteropus 'Windelov' watering schedule
• Microsorum pteropus 'Windelov' light requirements
• Best soil mix for microsorum pteropus 'windelov'
• Microsorum pteropus 'Windelov' fertilizing guide
• When to repot microsorum pteropus 'windelov'
• How to propagate microsorum pteropus 'windelov'
• Microsorum pteropus 'Windelov' growth rate & size
• Microsorum pteropus 'Windelov' cold hardiness
• Microsorum pteropus 'Windelov' temperature & humidity
• Is microsorum pteropus 'windelov' toxic to cats & dogs?
• Is microsorum pteropus 'windelov' toxic to cats?
• Is microsorum pteropus 'windelov' toxic to dogs?

Featured in these plant shortlists

Microsorum pteropus 'Windelov' qualifies for 2 curated Growli shortlists — each one filtered objectively from our structured plant-care library, so the selection is consistent and checkable:

• Best low-light houseplants — Houseplants that need no direct sun and cope with a north-facing room or a spot well back from a window.
• Best small & tabletop houseplants — Compact houseplants that stay under about 40 cm — desk, shelf and windowsill plants that never outgrow a small space.
• Browse all 29 plant shortlists — pet-safe, low-light, drought-tolerant and more

Related guides

Microsorum pteropus 'Windelov' is also commonly called Windelov Java fern or lace Java fern.

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