Houseplant · Nephrolepidaceae
Kimberly Queen Fern
Nephrolepis obliterata
Give it bright indirect light and steady moisture, and this upright sword fern stays full and tidy all year.
Bright indirect
Every 3–7 days
61–75°F · 16–24°C
USDA 9–11
Overview
The Kimberly Queen fern is a sword fern from Australia that has become one of the easiest ferns to keep indoors. Its fronds grow stiff and upright rather than spilling over the pot, so it holds a neat shape and drops far less debris than the familiar Boston fern. That tidy habit is most of the reason people choose it.
Under glass it reaches a comfortable 2 to 3 feet (60 to 90 cm) tall and spreads about as wide, filling a corner or a plant stand without taking over the room. It grows at a moderate pace and lives for years, so a single plant rewards a little steady care for a long time.
What it asks for is simple: light it can read by but not bake in, soil that stays damp without turning to mud, and air that isn't bone dry. Get those right and it stays lush. Let the rootball dry out and you'll see brown tips before long.
Care
The short version: bright indirect light, soil kept evenly moist but never soggy, and humidity on the higher side. Feed it monthly through the growing season and trim spent fronds at the base to keep it looking sharp.
Light
Give it bright indirect light, the kind near an east window or a few feet back from a brighter one. It puts up with partial shade and a little gentle sun, but harsh midday glare scorches the fronds.
Water
Keep the rootball evenly moist, watering once the top inch or so of soil feels dry, which usually lands every 3 to 7 days. Soak the whole rootball each time but never leave it waterlogged, and ease off a little through winter.
Soil
Plant it in a rich, humusy potting mix that drains freely, a peat-based blend with extra organic matter worked in. It likes things slightly acidic, around a pH of 5.5 to 6.5.
Temperature
Ordinary room warmth suits it, ideally between 61°F and 75°F (16°C to 24°C). Keep it clear of cold drafts and hot air vents, both of which dry and stress the fronds.
Humidity
This fern wants high humidity, around 40% to 70%, more than most homes offer in winter. Stand it on a pebble tray, group it with other plants, or run a humidifier to keep the tips from going crisp.
Feeding
Feed it monthly from spring to early fall with a balanced liquid houseplant fertilizer mixed at half strength. Skip feeding in winter while growth slows, and flush the pot now and then so salts don't build up.
Pruning
No hard pruning is needed here. Just snip off dead, browned, or yellowed fronds at the base as they appear, which keeps the plant looking sharp and makes room for fresh growth.
Repotting
Move it into a slightly larger pot every 1 to 2 years, or sooner if roots circle the pot or push out the drainage holes. Repotting in spring is also the natural time to divide an overgrown plant.
Size & spacing
Indoors it grows to about 2 to 3 feet (60 to 90 cm) tall with a spread of 2 to 4 feet (60 to 120 cm). Give it room on all sides so the upright fronds can arch out without crowding a wall or its neighbors.
Troubleshooting
Almost every problem with this fern shows up first in the fronds, and most trace back to water or air that's too dry. Read the signs early and the fix is usually small. Match what you see below, then adjust before the whole plant suffers.
Whole fronds yellowing as the plant fades
When fronds yellow and the plant slumps, the usual culprit is soggy soil and root rot from too much water. Too little light pushes it the same way. Let the surface dry before the next drink, make sure the pot drains, and move it somewhere brighter.
Fix:
- Let the top of the soil dry slightly and ensure the pot drains freely
- Move to a brighter spot with bright indirect light
- Remove rotted roots and repot into fresh, well-draining mix if rot is present
Sticky film, fine webbing, or little bumps on the fronds
Hot, dry air invites spider mites, which leave fine webbing and a faint stippling on the leaves. Sticky residue or small brown and white bumps point to scale or mealybugs instead. Rinse the foliage, raise the humidity, and isolate the plant while you wipe the pests off.
Fix:
- Rinse the foliage and raise humidity to discourage mites
- Wipe scale and mealybugs off or dab with insecticidal soap
- Isolate the plant until the infestation is controlled
Brown, crispy tips along the edges of the fronds
Crispy brown tips almost always mean the air is too dry or the rootball dried out between waterings. A buildup of fertilizer salts can scorch the edges too. Raise the humidity, water more steadily, and flush the pot now and then to wash the salts away.
Fix:
- Raise humidity with a pebble tray, grouping plants, or a humidifier
- Keep the rootball evenly moist and water more consistently
- Flush the pot occasionally to leach out accumulated fertilizer salts
- Trim off badly browned fronds at the base
Toxicity
Good news for pet owners: this is a true fern with nothing toxic in it. The ASPCA lists Nephrolepis ferns as non-toxic to cats and dogs, and the same goes for other household animals. The most a curious pet risks from a mouthful of the fibrous fronds is a brief, mild stomach upset.
Safe for
People · Cats · Dogs · Horses · Rabbits · Livestock · Birds
Cats None
Safe to share a room with. A cat that nibbles a frond out of boredom faces no poisoning, though a big mouthful of the fibrous leaf may bring on a little drooling or a hairball-style upset that passes on its own.
Dogs None
No toxins here, so a curious dog can chew a frond without harm. Eating a lot of the stringy foliage at once might loosen the stomach briefly, but it settles without treatment.
Horses Safe
This true fern carries nothing that would poison a horse, so an accidental graze is no cause for worry.
Rabbits Safe
A rabbit can nibble the fronds safely. It isn't a staple food, so offer only the odd taste alongside its regular hay and greens.
Livestock Safe
Goats, sheep, and cattle won't be poisoned by this fern if they reach a potted plant or one grown outdoors.
Birds Safe
Pet birds can perch in and pick at the fronds without risk, which makes it an easy choice for a home with parrots or finches.
People Safe
Handling and growing this fern is safe for adults and children alike. It isn't grown for eating, so there's no edible part to seek out, just a plant that's harmless to have around.
Although non-toxic, the fibrous fronds can cause mild, temporary stomach upset if a pet eats a large amount.
Varieties
This fern is grown and sold as a single named selection rather than a range of cultivars, so there's really just one to know.
'Kimberly Queen'
This is the clonal selection of Nephrolepis obliterata sold in nearly every garden center, prized for its stiff, upright sword-shaped fronds that shed far less mess than the arching Boston fern.
How to propagate
Making more Kimberly Queen ferns is easy and free, since the plant divides cleanly and also spreads on its own by runners.
DivisionEasy
Spring to early summer, ideally at repotting · 4 to 8 weeks
The simplest way to make more plants is by division, done in spring or early summer when you repot. Split the rootball into sections that each keep a share of roots and several fronds, then pot them up on their own, and they settle in over 4 to 8 weeks. Sword ferns also send out runners and spread on their own.
Myths
Kimberly Queen fern is poisonous to cats and dogs.
The ASPCA lists Nephrolepis ferns as non-toxic to both cats and dogs. The plant poses no poisoning risk, and the worst a pet faces from a big bite of frond is a brief, harmless stomach upset.
Like every fern, it has to live in deep shade.
Sword ferns in this group take more light than the Boston fern does. Dappled sun or a bright morning spot suits them well, as long as you keep them out of harsh midday glare that scorches the fronds.