Crocodile fern (alligator fern) care

Light

Crocodile fern wants the spot a few feet back from a sunny window — bright enough to read a paperback at noon, but the sun never falls directly on the leaves. Medium to bright indirect light; avoid direct sun. A faint hand shadow at midday is the right amount; a sharp dark shadow means it's getting direct sun and probably too much.

Watering

Water crocodile fern when the top 1-2 cm of soil is dry, every 4-7 days. 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. Keep soil consistently moist; ferns suffer fast from drying out.

Soil and pot

Crocodile fern grows best in rich free-draining mix. Compost with orchid bark and perlite for aeration. 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

Crocodile fern sits happiest at around 60-70% humidity and 18-27°C (65-80°F). High humidity essential; misting alone is not enough — use a humidifier. If you keep the room above 18 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 crocodile fern sparingly. Quarter-strength balanced feed every 4-6 weeks in growing season. 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 crocodile fern in the Growli community. Each is annotated with the most common cause so you know where to start.

• Faded crocodile pattern — Too much direct sun or insufficient light.
• Brown frond edges — Low humidity.
• Yellow fronds — Overwatering or rot.
• Spider mites — Stippling under fronds in dry rooms.

Propagation

Divide established rhizomes in spring. 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

Crocodile fern is pet-safe. Microsorum species are not listed by the ASPCA. Considered safe around cats and dogs. 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.

Crocodile fern deep-dive guides

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

• Common crocodile fern problems & fixes
• Crocodile fern watering schedule
• Crocodile fern light requirements
• Best soil mix for crocodile fern
• Crocodile fern fertilizing guide
• When to repot crocodile fern
• How to propagate crocodile fern
• How to prune crocodile fern
• What's eating my crocodile fern?
• Crocodile fern growth rate & size
• Crocodile fern cold hardiness
• Crocodile fern temperature & humidity
• Is crocodile fern toxic to cats & dogs?
• Is crocodile fern toxic to cats?
• Is crocodile fern toxic to dogs?
• All 13 Microsorum varieties

Featured in these plant shortlists

Crocodile fern qualifies for 10 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 plants for a north-facing window — Houseplants for a north-facing window: bright, even, indirect light and no scorching direct sun. Each pick verified against its documented light needs.
• 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 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.
• Browse all 30 plant shortlists — pet-safe, low-light, drought-tolerant and more

Related guides

Crocodile fern is also commonly called alligator fern or crocodile leaf fern.

• Large-flowered Tylecodon care — light, water and common problems
• Buchholz's Tylecodon care — light, water and common problems
• Pencil-leaf Tylecodon care — light, water and common problems
• All 10153 plant care guides in the Growli library