Walking Fern (Walking Spleenwort) care

Light

Most houseplants sulk in a dim corner. Walking Fern is one of the handful that doesn't. Deep to dappled shade; bright indirect light at most. Direct sun scorches the thin fronds. Mimic its native shaded limestone-cliff habitat with filtered, low-intensity light. The tell that you've pushed even a low-light plant too far is soil that stays wet for a week — the plant has stopped transpiring, which means it's stopped using water, which is one short step from rot.

Watering

Water walking fern keep substrate evenly moist at all times; check every 3-5 days and never let it dry fully. The actual day count varies with pot size, light, and season — the finger test (or lifting the pot to feel its weight) is more reliable than a fixed calendar. Empty any drainage saucer afterwards so the pot isn't sitting in water. Water with low-mineral or slightly alkaline water to keep the rooting medium consistently damp but not waterlogged. Drying out kills the delicate frond tips before they can root.

Soil and pot

Walking Fern grows best in gritty, alkaline, sharply draining mix. Use a limestone-based blend: loam or peat-free compost cut with crushed limestone chips, grit and a little leaf mould. It naturally grows on moss-covered calcareous rock, so add lime if your medium is acidic. 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

Walking Fern sits happiest at around 60-80% humidity and 10-21°C (50-70°F). High humidity is essential; a closed terrarium or shaded fern case is ideal. Dry indoor air browns the frond tips and prevents the walking, tip-rooting habit. If you keep the room above 10 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 walking fern sparingly. Feed sparingly, no more than every 6-8 weeks in spring and summer with a quarter-strength balanced liquid fertiliser. This low-nutrient rock dweller is easily burned, so under-feed rather than over-feed. 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 walking fern in the Growli community. Each is annotated with the most common cause so you know where to start.

• Browning, crispy frond tips — Caused by low humidity or letting the substrate dry out. Raise humidity in a terrarium and keep the rooting medium evenly moist.
• Fronds fail to root and walk — Tips only produce plantlets when they reach consistently moist, gritty substrate. Pin arching tips down onto damp limestone-rich medium to encourage colonising.
• Yellowing or rot at the crown — Usually waterlogging or acidic, poorly drained soil. Add limestone grit, improve drainage, and avoid leaving water sitting in the crown.
• Scorched, faded fronds — Direct sun or light that is too strong bleaches and burns the thin fronds. Move to deeper shade or filtered light.

Propagation

Easiest by pegging arching frond tips onto moist, gritty substrate so they root and form plantlets, then severing once established. Also propagated from spores sown on a sterile, lime-rich surface kept humid and shaded. 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

Walking Fern is pet-safe. Asplenium is a true fern genus and is not on the ASPCA toxic list; true ferns are generally ASPCA-listed as non-toxic to cats and dogs. No toxic principle is reported. Ingestion may still cause mild stomach upset in pets simply from eating plant fibre. 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.

Walking Fern deep-dive guides

Every aspect of walking fern care, each with its own calibrated guide:

• Walking Fern watering schedule
• Walking Fern light requirements
• Best soil mix for walking fern
• Walking Fern fertilizing guide
• When to repot walking fern
• How to propagate walking fern
• Walking Fern growth rate & size
• Walking Fern cold hardiness
• Walking Fern temperature & humidity
• Is walking fern toxic to cats & dogs?
• Is walking fern toxic to cats?
• Is walking fern toxic to dogs?

Featured in these plant shortlists

Walking Fern qualifies for 12 curated Growli shortlists — each one filtered objectively from our structured plant-care library, so the selection is consistent and checkable:

• Best pet-safe houseplants — Houseplants the ASPCA lists as non-toxic to cats and dogs — every one verified against the ASPCA toxic and non-toxic plant list.
• 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 pet-safe low-light plants — Non-toxic to cats and dogs AND happy with no direct sun — the two hardest constraints to satisfy at once.
• Best humidity-loving houseplants — Houseplants that thrive in a bathroom, kitchen, or by a humidifier — selected by documented humidity preference.
• Best bathroom plants — Humidity-loving houseplants that also cope with lower light — suited to the steamy, often-dim conditions of a typical bathroom.
• Best pet-safe bathroom plants — Non-toxic to cats and dogs and happy in the humid, lower-light conditions of a bathroom — safe greenery for the smallest room.
• Best small & tabletop houseplants — Compact houseplants that stay under about 40 cm — desk, shelf and windowsill plants that never outgrow a small space.
• Best houseplants for a cool room — Houseplants that tolerate cool conditions down to about 10°C — for an unheated spare room, hallway, porch or a home kept cool.
• Best pet-safe bedroom plants — Non-toxic to cats and dogs and happy in lower light — calming greenery for a bedroom where a pet often sleeps too.
• Best cat-safe plants — Houseplants the ASPCA lists as non-toxic to cats (and dogs) — safe greenery for a home with a curious cat.
• Best dog-safe plants — Houseplants the ASPCA lists as non-toxic to dogs (and cats) — safe greenery for a home with a curious dog.
• Best small pet-safe plants — Compact, tabletop houseplants that are also ASPCA non-toxic to cats and dogs — safe greenery for a desk or shelf.
• Browse all 29 plant shortlists — pet-safe, low-light, drought-tolerant and more

Related guides

Walking Fern is also commonly called Walking Fern or Walking Spleenwort.

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