Macho Fern (Giant Sword Fern) care

Light

Macho 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. Prefers bright indirect to moderate light. Outdoors it tolerates filtered shade well. Indoors, a position near a large north or east window, or in a bright room away from direct sun, suits it best. Direct afternoon sun in summer scorches the broad pinnae; deep shade causes poor growth. 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 macho fern every 2–4 days in summer; every 5–7 days in winter. 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. Given its large frond surface area, Nephrolepis biserrata transpires heavily and needs regular watering. Keep soil consistently moist in the growing season. In winter or cool conditions, reduce frequency. Always check that the potting mix is not waterlogged; good drainage is critical.

Soil and pot

Macho Fern grows best in rich, well-draining potting mix. Use a quality peat-free multipurpose compost with added perlite or coarse sand (3:1) for drainage. A slightly acidic pH of 6.0–6.5 is ideal. This large fern benefits from a heavier compost substrate than smaller ferns to anchor its substantial root system. 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

Macho Fern sits happiest at around 50–70% humidity and 16–32°C (61–90°F). Moderate to high humidity keeps the broad fronds lush and prevents browning. Outdoors in tropical or subtropical climates, ambient humidity is usually sufficient. Indoors, use a humidifier or pebble tray. Macho fern is somewhat more humidity-tolerant of variation than maidenhair ferns. If you keep the room above 16–32°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 macho fern sparingly. Apply a balanced slow-release granular fertiliser in spring, supplemented by a monthly liquid feed at half-strength through summer. The large biomass benefits from regular nutrition. Stop feeding in autumn and winter. Avoid excess phosphorus, which can cause tip burn. 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 macho fern in the Growli community. Each is annotated with the most common cause so you know where to start.

• Frond tip browning — Common in dry indoor environments. Caused by low humidity, inconsistent watering, or salt build-up from hard tap water. Flush the pot with rain water monthly, raise humidity, and water before the soil dries out. Trim brown tips with clean scissors — they will not regenerate.
• Overrunning containers — This is a vigorous fern that quickly becomes root-bound and sends out stolons that spill over pot edges. Repot annually in spring into a container two sizes larger, or divide the plant and repot sections. Outdoor specimens may need containment to prevent spreading.
• Aphids and whitefly — Large, lush fronds attract aphids and whitefly, particularly in outdoor or greenhouse settings. Inspect regularly and treat with insecticidal soap spray or neem oil, targeting the undersides of pinnae. Encourage natural predators such as ladybirds (ladybugs) in outdoor settings.

Propagation

Divide clumps in spring by separating the rhizome into sections, each with healthy fronds and roots. Macho fern also produces stolons that can be pegged into moist compost to root while still connected to the parent plant. Once rooted (typically 4–6 weeks), sever and pot on. 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

Macho Fern is pet-safe. Nephrolepis biserrata is a member of the Nephrolepis genus, which the ASPCA lists as non-toxic to dogs and cats. The macho fern poses no known toxic risk to companion animals. 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.

Macho Fern deep-dive guides

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

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

Featured in these plant shortlists

Macho Fern qualifies for 13 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 drought-tolerant houseplants — Houseplants that prefer to dry out — forgiving of forgotten watering and ideal for travel or busy weeks.
• Best houseplants for beginners — Forgiving of irregular light and watering — the houseplants least likely to die in a new plant parent’s first season.
• 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 low-maintenance plants — Non-toxic to cats and dogs and forgiving of forgotten watering — the easiest safe choices for a busy pet household.
• 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 29 plant shortlists — pet-safe, low-light, drought-tolerant and more

Related guides

Macho Fern is also known as Macho Fern, Giant Sword Fern, and Bold Sword Fern.

• Mother Fern care — light, water and common problems
• Drooping Spleenwort care — light, water and common problems
• Crispy Wave Fern care — light, water and common problems
• All 6887 plant care guides in the Growli library