Houseplant · Nephrolepidaceae
Kimberly Queen Fern
Nephrolepis obliterata
Give it bright indirect light and steady moisture and this upright sword fern will stay full and tidy for you 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, and it happens to be one of the most forgiving ferns you can bring indoors. Its fronds grow stiff and upright instead of tumbling over the pot, so it holds a neat shape and drops far less mess than the well-known Boston fern. That easygoing tidiness is a big part of why so many growers reach for it.
Kept inside it settles at a comfortable 2 to 3 feet (60 to 90 cm) tall and spreads about as wide, so it fills a quiet corner or a plant stand without overwhelming the room. Its moderate growth and long, perennial life mean a little steady kindness pays you back for years to come.
What it asks of you is refreshingly simple: light it can bask in but not bake in, soil that stays damp without turning to mud, and air that isn't parched. Meet those and it stays lush and full. If the rootball dries out, don't panic, because you'll just see a few brown tips long before anything serious goes wrong.
Care
The short version: bright indirect light, soil kept evenly moist but never soggy, and humidity on the higher side keep this fern happy. Feed it monthly through the growing season and snip spent fronds at the base, and you'll have a plant that looks after itself.
Light
Give it bright indirect light, the sort you'd find near an east window or a step or two back from a brighter one. It's forgiving of partial shade and a little soft sun, so don't stress over the perfect spot, but do keep the harsh midday glare off it, as that can scorch the fronds.
Water
Aim to keep the rootball evenly moist, watering once the top inch or so of soil feels dry, which tends to work out to every 3 to 7 days. Soak the whole rootball each time and then let it drain, never leaving it waterlogged, and feel free to ease off a bit through winter.
Soil
Settle it into a rich, humusy potting mix that drains freely, a peat-based blend with some extra organic matter mixed through. It's happiest on the slightly acidic side, around a pH of 5.5 to 6.5.
Temperature
Ordinary room warmth is all it wants, ideally somewhere between 61°F and 75°F (16°C to 24°C). Just keep it away from cold drafts and hot air vents, since both tend to dry out and stress the fronds.
Humidity
This fern loves high humidity, around 40% to 70%, which is more than most homes offer in the depths of winter. Sit it on a pebble tray, cluster it with other plants, or run a humidifier, and you'll keep those tips from crisping up.
Feeding
Feed it once a month from spring to early fall with a balanced liquid houseplant fertilizer mixed at half strength. Let it rest through winter while growth slows, and rinse the pot through now and then so salts don't quietly build up.
Pruning
You won't need any hard pruning here, which is a relief. Just snip off dead, browned, or yellowed fronds at the base whenever they turn up, and that alone keeps the plant looking its best and opens room for fresh growth.
Repotting
Move it up into a slightly larger pot every 1 to 2 years, or a bit sooner if roots start circling or poking out the drainage holes. Spring repotting is also the natural moment to divide an overgrown plant if you'd like to.
Size & spacing
Indoors it reaches about 2 to 3 feet (60 to 90 cm) tall with a spread of 2 to 4 feet (60 to 120 cm). Leave it a little room on every side so those upright fronds can arch out freely without brushing a wall or crowding its neighbors.
Troubleshooting
Nearly every hiccup with this fern shows up first in the fronds, and most of them simply trace back to water or air that's a touch too dry. Catch the signs early and the fix is almost always a small one. Find what you're seeing below, then gently adjust before the rest of the plant feels it.
Fronds going yellow while the plant looks tired
When the fronds yellow and the whole plant seems to sag, the most likely cause is kindly meant overwatering that has left the soil soggy and started root rot. Too little light nudges it the same way. Don't worry, you can help it recover by letting the surface dry before the next watering, making sure the pot drains, and shifting it into a brighter spot.
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 patches, faint webbing, or tiny bumps on the fronds
Warm, dry air can invite spider mites, and they leave behind delicate webbing and a soft speckling across the leaves. Sticky spots or little brown and white bumps usually mean scale or mealybugs have moved in instead. None of this is the end of the plant, so give the foliage a good rinse, raise the humidity, and set the plant apart while you wipe the pests off gently.
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
Fronds turning brown and crisp along the tips
If you notice crisping at the tips, take heart, because it usually just means the air got too dry or the rootball went thirsty between drinks. Leftover fertilizer salts can nip the edges as well. You can turn this around by lifting the humidity, watering on a steadier rhythm, and rinsing the pot through now and then to carry those 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
Here's some reassurance for pet owners: this is a true fern with nothing toxic in it at all. The ASPCA lists Nephrolepis ferns as non-toxic to cats and dogs, and the same holds for other household animals. The very most a curious pet risks from a mouthful of the fibrous fronds is a brief, mild stomach upset that soon passes.
Safe for
People · Cats · Dogs · Horses · Rabbits · Livestock · Birds
Cats None
You can relax about the cat sharing a room with this one. A curious nibble brings no poisoning at all, and even a bigger mouthful of the fibrous frond might cause only a little drooling or a hairball-style tummy that eases off on its own.
Dogs None
Rest easy with dogs around, since there are no toxins here and a chewed frond does no harm. If a lot of the stringy leaf goes down at once it may loosen the stomach for a moment, but it soon settles by itself.
Horses Safe
You need not fret about horses, as this true fern holds nothing that would poison one, so a stray graze is simply nothing to worry about.
Rabbits Safe
A rabbit is welcome to nibble the fronds safely. Since it isn't a staple food, feel good about offering just the occasional taste alongside its usual hay and greens.
Livestock Safe
Goats, sheep, and cattle come to no harm from this fern, whether they reach a potted plant indoors or one growing outside.
Birds Safe
Your pet birds can perch among and pick at the fronds without any risk, which makes this a comfortable, worry-free pick for a home with parrots or finches.
People Safe
Growing and handling this fern is perfectly safe for grown-ups and children alike. It isn't raised for eating, so there's no edible part to hunt for, just a friendly plant that's harmless to keep close by.
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 whole spread of cultivars, so there's really only one to get to know, which keeps things nice and simple.
'Kimberly Queen'
You'll find this one selection of Nephrolepis obliterata on almost every garden center bench, loved for the stiff, upright sword-shaped fronds that keep their shape and drop far less litter than the arching Boston fern.
How to propagate
Making more Kimberly Queen ferns is easy and costs you nothing, since the plant divides cleanly and also spreads happily on its own by runners.
DivisionEasy
Spring to early summer, ideally at repotting · 4 to 8 weeks
The friendliest way to grow your collection is by division, and repotting time in spring or early summer is the perfect moment. Gently separate the rootball into pieces that each hold their own share of roots and a few fronds, pot them up individually, and they'll find their feet over the next 4 to 8 weeks. Even better, sword ferns throw out runners and quietly spread on their own.
Myths
Kimberly Queen fern will poison cats and dogs.
You can put this fear aside, because the ASPCA lists Nephrolepis ferns as non-toxic to both cats and dogs. There is no poisoning risk here at all, and the most a pet meets after a big bite of frond is a short, harmless bout of stomach upset.
Being a fern, it must be kept in deep shade.
Happily, sword ferns in this group welcome more light than the Boston fern ever would. A bright morning window or gentle dappled sun makes them thrive, so long as you spare them the harsh midday glare that scorches the fronds.