Tree · Araucariaceae
Norfolk Island Pine
Araucaria heterophylla
Under cool air, bright light, and even watering, this living conifer keeps its soft, needled tiers stacked neatly indoors all year.
Bright indirect
55–64°F · 13–18°C
USDA 9–11
3–6 ft · 0.9–1.8 m
Overview
The Norfolk Island pine is a living conifer clothed in soft, needle-like foliage that fans out along each branch in flat, feathery sprays. It comes from Norfolk Island in the South Pacific, where it grows into a towering tree, yet in a pot it holds to a manageable 3 to 6 feet (about 91 to 183 cm) tall. That soft, green, tiered look is why many keep one as a living alternative to a cut Christmas tree.
Up close the branches ring the trunk in neat, even whorls, each tier spaced above the last around a single straight, upright leader. It belongs to the genus Araucaria, an ancient Southern Hemisphere conifer far older than the true pines its needles echo. The regular spacing of those layered, feathery tiers gives the plant its clean, symmetrical outline.
The green stays soft and full only where the light, the air, and the watering hold steady. Growth is slow, and the plant will not replace anything it loses, so a branch that browns and sheds, or a cut leader, leaves a bare, ringed stem that stays empty. Keep the conditions right and the whorled tiers of needles hold their form for years.
Care
The short version: bright indirect light, cool rooms around 55°F to 64°F (13°C to 18°C), and soil kept evenly moist in the growing season but drier in winter. Give it humidity to keep the needles soft, never let it stand in water, and leave the central leader intact.
Light
Give it bright, indirect light, ideally near a sunny window where the direct rays are softened, which keeps the needles a deep, even green. It can take some full sun, but a little afternoon shade stops the foliage bleaching to a pale, washed-out cast, and a dim corner slowly thins the lower branches.
Water
Keep the soil evenly moist from spring through autumn, then ease off through winter. Let the top of the soil begin to dry between waterings, and never leave the pot standing in water. Read the feel of the soil and the firmness of the needles as your guide rather than a set schedule.
Soil
Plant it in a fertile, porous mix with plenty of sand and peat, kept slightly acidic. Sharp drainage is the key, since this conifer rots in soil that stays soggy.
Temperature
Cool rooms suit it best, ideally between 55°F and 64°F (13°C to 18°C). Keep it well clear of heat vents, and do not let it sit below 50°F (10°C) in winter.
Humidity
Average household humidity works, but dry, heated air is its main enemy indoors and shows first as browning needle tips. In a heated room, mist the foliage or set the pot near other plants to lift the moisture around it.
Feeding
Through spring and summer, a weak liquid feed supports the flush of soft new growth, given at weekly to fortnightly intervals. Come winter, withhold it, since the plant slows almost to a standstill and takes up little.
Pruning
This is a plant to mostly leave alone. Never top it or cut the central leader, because that breaks the whorled shape and no new leader grows. Limit yourself to removing dead or damaged lower branches.
Repotting
Repot only every 2 to 4 years, once it is clearly potbound. It prefers to sit a little rootbound and resents disturbance, so there is no need to move it up a size.
Size & spacing
Indoors it reaches 3 to 6 feet (91 to 183 cm) tall with a spread of about 2 to 3 feet (61 to 91 cm). Give it room on all sides so the needled tiers can spread evenly and stay symmetrical.
Troubleshooting
Most trouble on a Norfolk Island pine reads in the foliage itself, in the color and firmness of the needles, and it surfaces first along the lowest branches. Watching the green for early dulling or flecking lets you step in before a bare, ringed stem is left behind. Match the look below, then act while the needles are still soft and green.
Slumping branches over dark, waterlogged soil
Branches that slump while the soil sits dark and wet point to root rot, brought on by overwatering or a pot that will not drain, and at times the mushroom root rot fungus. Cutting back the water and emptying the saucer keeps the pot from standing in a shallow pool. Roots gone soft, dark, and slippery need a fresh porous mix. Reached this far, the rot can end the plant.
Fix:
- Reduce watering frequency
- Ensure pot drains freely and empty saucers
- Repot into porous, well-drained mix if rot is present
A sticky black glaze or fine silk across the needles
A tacky sheen darkening into a black, soot-like glaze over the needles reveals scale insects, since the sooty mold settles onto the sugary honeydew they leave. Faint pale flecks stippling the green, laced with thin silk, mark spider mites instead, which multiply in warm, dry rooms. Wiping the needles clean, coating them in horticultural oil or insecticidal soap, and raising the humidity strips the film and keeps mites off the foliage.
Fix:
- Wipe or wash foliage
- Treat with horticultural oil or insecticidal soap
- Increase humidity to discourage mites
The lowest branches fading to brown and falling away
When the soft green needles on the lowest branches dull to brown and shed, the usual cause is dry, heated indoor air, and the browning spreads once a plant has stood two or three years in a dim corner. A bright, cool room with more moisture in the air around it steadies the foliage. A shed tier leaves a bare, ringed stem that never refills, so the fading branches are worth catching while still green.
Fix:
- Move to a bright, cool room with indirect light
- Mist foliage or raise ambient humidity in heated rooms
- Keep soil evenly moist but not waterlogged
Toxicity
This plant is a mild concern at most. The ASPCA and NC State both list it as non-toxic to cats, dogs, and horses, though the sap can still leave a pet that chews the needles with an upset stomach or a little skin irritation. People are essentially safe, so the main job is keeping a determined chewer away from the soft, needled foliage.
Toxic to
Cats · Dogs
Safe for
People · Horses · Rabbits · Livestock · Birds
Cats Mild
A cat that bites into the slender, needle-like foliage may drool, be sick, or lose its appetite for a while, and the sap can leave the mouth or skin faintly irritated. The reaction stays mild and clears on its own, though a young plant is best set beyond the reach of a determined chewer.
Dogs Mild
A dog that gnaws the branches can pick up an upset stomach, with some drooling or vomiting, and the tacky, resinous sap may irritate the skin around the muzzle. None of it is dangerous in the amounts a pet takes, but a curious dog is worth steering away from the lower tiers.
Horses None
The ASPCA and NC State Extension both record it as non-toxic to horses, and a potted specimen on a windowsill is one a horse would almost never encounter.
Rabbits Safe
No toxin is on record for rabbits, and the rigid, resin-slicked needles offer a rabbit little worth chewing.
Livestock Safe
Nothing on the plant registers as a livestock poison, and a potted specimen sits well beyond where any grazing animal would reach.
Birds Safe
Pet birds register no reaction to the needled foliage, though the resin can smear a sticky, tacky film across feathers where a bird lands and pecks.
People Safe
Around people the plant is essentially safe, and nothing on it is grown to eat. The sap can leave sensitive skin a little itchy, so rinsing the hands after pruning settles that.
Helpline numbers
United States
ASPCA Animal Poison Control: (888) 426-4435 (fee applies)
United Kingdom
Animal PoisonLine: 01202 509000 (fee applies)
Australia
Animal Poisons Helpline: 1300 869 738
Varieties
There are no named cultivars to compare here, but one old botanical name still follows this plant through the houseplant trade.
Araucaria excelsa (former name)
This older synonym still shows up printed on plant labels and through the houseplant trade, yet it stands for the very same plant sold today as Araucaria heterophylla.
How to propagate
A Norfolk Island pine is far easier to buy than to raise, and the whorled, even shape of any new plant depends entirely on which growth it starts from.
SeedModerate
Sow when fresh in moist, sandy, peaty soil · Several weeks to germinate; slow to develop into a sizeable plant
Seed is the main way to raise this plant. Fresh seed pressed into a moist, sandy, peaty mix takes several weeks to break the surface and far longer to fill out into anything sizeable. The wait yields a plant carrying the proper upright leader and the even, whorled tiers of soft green needles the species is known for.
Stem cuttingsDemanding
From terminal (leader) growth · Slow and unreliable
Cuttings take only from the upright leader tip, and even then rooting stays slow and unreliable. A cutting snipped from a side branch will root, but it keeps the sideways slant of that branch and grows into a lopsided, distorted plant, never matching the even form of a seedling.
Myths
The Norfolk Island pine is a true pine.
For all that the branches are lined with needle-like foliage, the plant sits in the genus Araucaria, family Araucariaceae, and not in Pinus. It is an ancient Southern Hemisphere conifer native to Norfolk Island, far older than the true pines its foliage mimics. The pine in its name is a resemblance, not a relation.
Every part of a Norfolk Island pine is dangerously poisonous for cats and dogs.
Under its 'Australian Pine' entry, the ASPCA records Araucaria heterophylla as non-toxic to cats, dogs, and horses, with NC State in agreement, so the common toxic label simply misreads the plant. The true risk stays mild: a pet that gnaws the needled foliage might drool, turn queasy, or pick up a faint sting on the skin where the sap touches, and no more than that.