Ring Fern (Scented Fern) care

Light

In the wild ring fern grows on the bright edge of a forest canopy, not in the canopy and not in the open. Indoors, that translates to within a metre of an unobstructed window, sheer curtain optional. Performs best in full sun to light dappled shade. Unlike most ferns, Paesia scaberula naturally grows on open, sun-exposed rocky slopes and actually produces its finest, most robust fronds in direct or near-direct light. In deep shade the fronds become lax and growth slows; a position in full sun with shelter from cold wind suits it well. The fastest test: a hand held at the leaf casts a soft-edged shadow at noon — sharp shadow means too much sun, no shadow means too little light.

Watering

Aim for water when the top 3–5 cm of soil is dry — more drought-tolerant than most ferns once established for ring fern, but treat that as a starting point rather than a rule. A south-facing summer windowsill will dry the pot twice as fast as a north-facing winter room. Lift the pot; if it feels noticeably lighter than it did wet, water it. Once the rhizomes are established (usually after the first growing season), Paesia scaberula is notably drought-tolerant for a fern, reflecting its origin on rocky, freely draining New Zealand cliffs. In containers, allow the top few centimetres to dry between waterings. In the ground, established plants rarely need supplemental irrigation except during extended summer dry spells.

Soil and pot

Ring Fern grows best in moist but well-drained, humus-rich soil; tolerates clay, loam, sand, and chalk. One of the least fussy ferns for soil type — it grows in chalk, clay, loam, and sand in cultivation. The critical requirement is good drainage combined with adequate organic matter. Incorporate leaf mould or composted bark at planting to improve moisture retention without waterlogging. Avoid permanently waterlogged soils. 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

Ring Fern sits happiest at around 40–70% humidity and -5 to 28°C (23 to 82°F). Far more tolerant of lower humidity than most ferns and does not require misting or supplemental humidity indoors. Its tolerance of drier air and open, windy sites distinguishes it from most cultivated ferns. In very dry indoor conditions, fronds may develop crispy tips — a light occasional misting will suffice. If you keep the room above 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 ring fern sparingly. Apply a balanced slow-release fertiliser once in spring; the plant is a vigorous grower and benefits from light feeding to maintain lush frond production, but avoid over-feeding, which encourages excessive rhizome spread. 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 ring fern in the Growli community. Each is annotated with the most common cause so you know where to start.

• Invasive rhizome spread — The long-creeping rhizomes spread rapidly in suitable conditions and can overwhelm neighbouring plants or colonise unwanted areas — contain by planting inside a buried rhizome barrier or lift and divide the colony every 2–3 years to keep it within bounds.
• Frost dieback in borderline zones — In USDA zone 8 or at the margins of RHS H3, fronds die back after hard frost but rhizomes typically survive; apply a 10 cm mulch of shredded bark or dry bracken over the crown in late autumn to protect the rhizomes and encourage faster spring regrowth.

Propagation

Division of the spreading rhizome in spring is the easiest and most reliable method — cut sections with 2–3 growing nodes and replant immediately at the same depth. Spore propagation is possible on moist, humus-rich compost in a humid propagator but is slower and less reliable. 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

Ring Fern is mildly toxic to pets. Paesia scaberula is not listed in the ASPCA Toxic and Non-Toxic Plant database. No toxic principles have been documented for this New Zealand genus, but the absence of an ASPCA safety listing means the plant cannot be confirmed as non-toxic to cats and dogs. Classify as mildly-toxic and prevent pets from ingesting the fronds as a precaution. 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.

Ring Fern deep-dive guides

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

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

Featured in these plant shortlists

Ring Fern qualifies for 4 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 drought-tolerant houseplants — Houseplants that prefer to dry out — forgiving of forgotten watering and ideal for travel or busy weeks.
• 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 fast-growing houseplants — Houseplants documented as fast or vigorous growers — quick to fill a pot, cover a pole or trail down a shelf.
• Browse all 29 plant shortlists — pet-safe, low-light, drought-tolerant and more

Related guides

Ring Fern is also known as Ring Fern, Scented Fern, Lace Fern, and Scented Lace Fern.

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