Lemmaphyllum microphyllum (Button Fern) care

Light

Bright but filtered. Lemmaphyllum microphyllum burns within days in unfiltered south-facing summer sun, and stops growing within months in deep shade. Bright indirect to medium light suits it well; the small succulent fronds scorch in direct sun. In good filtered light it stays dense and compact. If you only have a south window, set the plant back 1.5 m or hang a sheer curtain — both knock the intensity down into the right range.

Watering

Watering lemmaphyllum microphyllum: when the mount or mix is nearly dry, roughly every 4-7 days. 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. Likes regular light watering but stores moisture in its fleshy fronds and dislikes sitting wet. Mist or dunk mounts and allow them to approach dryness; cut back in cooler months.

Soil and pot

Lemmaphyllum microphyllum grows best in epiphytic — mount or very open mix. Best mounted on bark or cork, or grown in a coarse orchid-bark and perlite blend with a little moss. Ordinary potting soil retains too much water and rots the creeping rhizome. 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

Lemmaphyllum microphyllum sits happiest at around 60-80% humidity and 16-27°C (61-81°F). A high-humidity epiphyte that thrives in terrariums and enclosed cases. The fleshy fronds tolerate moderate room humidity better than fine-leaved ferns, but growth slows in dry air. If you keep the room above 16 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 lemmaphyllum microphyllum sparingly. Feed lightly every 4-6 weeks in spring and summer with a quarter to half-strength balanced fertiliser, ideally as a dilute foliar feed. Its small epiphytic roots are easily burned, so keep feeds weak. 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 lemmaphyllum microphyllum in the Growli community. Each is annotated with the most common cause so you know where to start.

• Fronds shrivelling on mounts — Mounted specimens dry quickly; if the coin-shaped fronds pucker, water or soak more often while still permitting brief drying.
• Rhizome rot — Constant wetness or a dense mix rots the slender rhizome. Use an open medium and let surfaces dry between waterings.
• Slow or stalled growth — Usually too cold or too dry. Keep warm and humid, ideally in an enclosed terrarium, for steady creeping growth.
• Scale insects — Tiny scale can hide among the small fronds and rhizome. Inspect closely and dab with horticultural oil at first sign.

Propagation

Propagate by dividing the creeping rhizome into sections that each carry several fronds and roots, then mounting them or pressing onto damp moss until established. Spore propagation is possible but slow and exacting. 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

Lemmaphyllum microphyllum is mildly toxic to pets. Lemmaphyllum microphyllum is not individually listed by the ASPCA, and the genus Lemmaphyllum does not appear on the ASPCA non-toxic list. Although true ferns are generally regarded as non-toxic, without explicit ASPCA grounding for this species or genus, treat with caution and verify with a vet; assume mild stomach upset is possible if eaten. 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.

Lemmaphyllum microphyllum deep-dive guides

Every aspect of lemmaphyllum microphyllum care, each with its own calibrated guide:

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

Featured in these plant shortlists

Lemmaphyllum microphyllum qualifies for 3 curated Growli shortlists — each one filtered objectively from our structured plant-care library, so the selection is consistent and checkable:

• 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 humidity-loving houseplants — Houseplants that thrive in a bathroom, kitchen, or by a humidifier — selected by documented humidity preference.
• 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

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Lemmaphyllum microphyllum is also commonly called Button Fern or Coin-leaf Fern.

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