Kimberly Queen Fern
Nephrolepis obliterata · Australian Sword Fern
It grows in humid tropical forest across Papuasia, northern Australia and the West Pacific, on the ground and on tree trunks alike. It is the same genus as the Boston fern, but its fronds stand stiff and upright instead of sprawling, which is why it sells as the tidier alternative.
Family
Nephrolepidaceae
Origin
West Pacific
In the wild
Forest, on ground or trees
Indoors
0.6–0.9 m
Growth
Moderate
With pets
Non-toxic
Where it's from
Papuasia, northern Australia and the West Pacific
Not Australian-only
Despite the name, its native range runs from New Guinea and the Solomon Islands to Fiji, Samoa and New Caledonia, with northern Australia just one edge.
Ground and tree
It grows terrestrially and as an epiphyte, rooting into bark in moist, shaded forest.
Outdoors: zones 9–11
Frost-tender. Grown as a houseplant or a summer container plant everywhere colder.
A misspelled trademark
The market name 'Kimberly Queen' is a respelling of 'Kimberley Queen', a trademarked clone of Westland Laboratories, with the second 'e' quietly dropped. And 'Australian sword fern' undersells it, because the species ranges right across the West Pacific. The real tell against the Boston fern is the shape: this one stands upright instead of cascading.
Upright, not arching
Stiff vertical fronds in a neat fountain, the opposite of the Boston fern's sprawl.
Sheds less
A selling point over the Boston fern: it drops far fewer leaflets indoors.
No flowers, ever
Like all ferns it reproduces by spores in sori on the frond undersides.
How to keep it
LightBright, indirect
More sun-tolerant than most ferns. Medium light is fine, no harsh direct sun.
WaterKeep evenly moist
Consistently moist, never waterlogged. Sensitive to both over and under-watering.
HumidityPrefers highHandles lower humidity better than the Boston fern, but very dry air still browns the tips.
Temperature16–24°CNo frost. Treat as an annual or bring it indoors in cold winters.
SoilRich, well-draining mixOrganic potting mix that holds moisture but still drains.
FeedingBarelyA general feed once or twice a year is plenty. Ferns dislike heavy feeding.
DifficultyEasy to moderateOne of the easier ferns, but keep the soil from drying out.
With petsNon-toxicNo toxic compound in the genus. Large amounts of any plant can still cause mild stomach upset.
PropagationDivisionSplit the clump or rooted runners to keep the named clone true. The wild species grows from spores.
RepottingEvery 1–2 yearsWhen rootbound. Divide at the same time.
What the data says
What it costs
A mass-produced, seasonal garden-centre plant with no collector market.
$15–40
A hanging basket or 10-inch patio pot, often cheaper in spring. No rare form commands a premium.
The air-purifier claim
Retailers tag this fern as an air purifier on the strength of one sealed lab chamber.
100–1,000
plants per square metre would be needed to match a room's normal ventilation (Cummings and Waring, 2019). NASA's 1989 test used a sealed box with no airflow. Buy it for the upright shape and the easy care.
IUCN · Not assessed
In the wild
A wide-ranging, vigorous fern in no documented danger.
Nephrolepis obliterata has not been assessed on the IUCN Red List, and with a range spanning Papuasia, northern Australia and the West Pacific it faces no significant threat. Worth a check on the tag, though: its relative N. cordifolia is an aggressive invader in Florida and Hawaii.
When it sulks
Brown, crispy frond tipsThe most common complaint. Air too dry, or the soil dried out.
Yellowing frondsOverwatering and poor drainage, or too much harsh sun.
Thinning and frond dropDry air, dry soil or a sudden change of spot. It still sheds less than a Boston fern.
PestsScale, mealybugs, whitefly and spider mites.
Varieties & company
The varieties
Kimberley QueenSunjest
Pairs with · keep apart from
Boston FernCalatheaPeace LilySnake PlantCactiSucculents
A new plant, every week.
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