Marie's Davallia (Ball Fern) care

Light

Bright but filtered. Marie's Davallia burns within days in unfiltered south-facing summer sun, and stops growing within months in deep shade. Prefers bright, indirect light. Grow near a well-lit window out of direct sun, which scorches the delicate fronds. It tolerates moderate light but grows best with good brightness. Suitable for east- or west-facing windowsills, or back from a south-facing window with sheer curtains. 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 marie's davallia: every 5–10 days in the growing season; minimal in winter dormancy. 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. Water when the top half of the growing medium dries. During summer growth flush thoroughly; during autumn reduce watering and in winter (when the plant is dormant) water only enough to prevent the rhizomes from desiccating completely — roughly once every 3 weeks. Resume normal watering when new fronds emerge in spring.

Soil and pot

Marie's Davallia grows best in free-draining epiphytic mix or sphagnum moss. Use coarse orchid bark, perlite, and a small amount of fine compost (2:1:0.5), or wrap roots in sphagnum moss for kokedama-style display. Heavy, moisture-retentive composts cause rhizome rot. The plant also does well mounted on cork bark or wood slabs. 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

Marie's Davallia sits happiest at around 40–65% humidity and 5–25 °C (41–77 °F). Tolerates average indoor humidity levels better than tropical Davallia species, reflecting its East Asian climate origins with distinct dry, cool winters. During active growth, humidity above 50% keeps fronds crisp. Dry air is less damaging here than for tropical ferns, but avoid prolonged exposure to below 35%. If you keep the room above 5–25 °C 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 marie's davallia sparingly. Apply a dilute balanced liquid feed (quarter to half strength) monthly during the active growing season from spring to late summer. Do not feed during winter dormancy. Light feeding prevents salt build-up in the fine-textured growing medium and avoids burning the surface rhizomes. 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 marie's davallia in the Growli community. Each is annotated with the most common cause so you know where to start.

• Frond drop / apparent death in winter — This is normal deciduous behaviour. Davallia mariesii naturally drops fronds in late autumn and becomes dormant through winter, especially in cooler conditions. Keep rhizomes barely moist and do not discard the plant — new fronds will emerge in spring as temperatures rise.
• Rhizome rot — Overwatering or excessive moisture during dormancy causes soft, blackened rhizomes. Water very sparingly in winter and ensure the growing medium drains freely. Cut out rotted sections and dust cuts with powdered sulphur or cinnamon to prevent spread.
• Pale or stunted new fronds — Usually a sign of insufficient light or nutrient depletion after several years in the same medium. Move to a brighter position and apply a dilute balanced fertiliser during the growing season. Repot every 2–3 years to refresh the growing medium.

Propagation

Cut healthy rhizome sections 4–6 cm long with a node or bud present. Lay sections on the surface of moist sphagnum moss or a bark mix and hold down with wire or hairpins. Keep at 18–22 °C in a sheltered, bright spot. New fronds typically emerge within 6–10 weeks. Division of large clumps in spring is also effective. 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

Marie's Davallia is pet-safe. Davallia mariesii belongs to the family Davalliaceae. Davallia ferns are not listed as toxic to cats or dogs by the ASPCA. No toxic compounds have been identified in this genus, and the creeping rhizomes, though tempting to pets, are considered non-toxic. 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.

Marie's Davallia deep-dive guides

Every aspect of marie's davallia care, each with its own calibrated guide:

• Marie's Davallia watering schedule
• Marie's Davallia light requirements
• Best soil mix for marie's davallia
• Marie's Davallia fertilizing guide
• When to repot marie's davallia
• How to propagate marie's davallia
• Marie's Davallia growth rate & size
• Marie's Davallia cold hardiness
• Marie's Davallia temperature & humidity
• Is marie's davallia toxic to cats & dogs?
• Is marie's davallia toxic to cats?
• Is marie's davallia toxic to dogs?

Featured in these plant shortlists

Marie's Davallia qualifies for 6 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 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 plants for bright light — Non-toxic to cats and dogs and happy in a bright, sunny spot — safe plants for your best-lit windowsill.
• 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 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 29 plant shortlists — pet-safe, low-light, drought-tolerant and more

Related guides

Marie's Davallia is also known as Marie's Davallia, Ball Fern, Squirrel's Foot Fern, and Japanese Hare's Foot Fern.

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