Tree · Pinaceae
Norway Spruce
Picea abies
Tough, fast, and cold-hardy down to -40°F (-40°C), the Norway spruce grows into a towering evergreen with sweeping, pendulous branches.
Full sun
Every 7–14 days
USDA 2–7
39–59 ft · 12–18 m
Overview
Norway spruce is the big, fast-climbing evergreen that powers so many windbreaks, screens, and old farmyard plantings across the cold north. It hails from Europe and has spread into temperate gardens everywhere, winning gardeners over with how fast it shoots up and how much weather it brushes aside. Look up at a mature one and you will catch gracefully drooping branchlets hanging from upswept limbs, lending the whole tree that soft, weeping silhouette.
Plant this one for space and patience, and it repays you tenfold. It surges past 100 feet in the wild and racks up a solid 40 to 60 feet in a yard, carrying a broad pyramidal crown over a shallow root system that spreads wide instead of diving deep. Long cones, the largest any spruce produces, swing from the upper branches and pile on the spectacle. Hand it room and it grows into a landmark, but jam it against a house and regret sets in within a decade.
The real thrill is its flat-out toughness. It powers through brutal cold, tackles a range of sites, and stares down the needlecast and canker diseases that hobble fussier spruces. Keep its feet moist and its head in the sun, and it barrels along asking for almost nothing else.
Care
The short version: full sun, moist but well-drained slightly acidic soil, and plenty of elbow room. It grows cold-hardy and low-maintenance once established, so it needs little feeding and only light pruning to keep charging along.
Light
Norway spruce craves full sun and rockets to its densest, healthiest self under all-day light. It will handle some partial sun, but a shaded tree thins out and grows more open, and strong sun also drives back the needle diseases that lurk on stressed trees.
Water
Keep the soil consistently moist but well-drained, soaking it deeply while the tree establishes and through any drought. It has zero patience for either extreme, sulking in soggy ground and struggling on hot, dry sites, so water roughly every 7 to 14 days when the rain falls short.
Soil
Hand it moist, well-drained, sandy loam on the acidic side, ideally a pH of 5.0 to 6.0. It rolls with a fair range of ground but balks at heavy, waterlogged clay, where its shallow roots simply cannot breathe.
Temperature
Few trees take the cold like this one, powering through temperatures from -40°F to 95°F (-40°C to 35°C). It thrives in the cool north and slows to a crawl where summers run long and hot.
Humidity
Ordinary outdoor humidity keeps it happy, so skip chasing any figure. Air movement matters far more, since still, crowded conditions roll out the welcome mat for the needlecast fungi that plague stressed trees.
Feeding
An established Norway spruce rarely needs feeding and cruises along on its own in decent ground. If growth stalls, a balanced slow-release feed in spring does the job, and rich soils may want none at all.
Pruning
Keep pruning light, snipping out dead, damaged, or crossing branches in late winter. Never top the tree, since that wrecks its form. If a weevil takes the leader, train one upright side shoot to shoot up and take over.
Repotting
none
Size & spacing
This is a forest giant gearing up, blasting to 40 to 60 feet (12 to 18 m) tall and spreading 25 to 30 feet (7.5 to 9 m) across. Plant it well clear of buildings, drives, and utilities, because its shallow roots run wide and the crown just keeps swelling.
When to plant
Forget any harvest clock with a spruce and just aim for the right planting window. Get it in the ground in spring or early fall so the roots dig in before summer heat or the deep winter freeze, and cheer for its grit, since it powers through the coldest zones, right down through zone 2.
Northern hemisphere
Southern hemisphere
Typical months for a temperate climate: start earlier in warm zones, later where spring frosts linger.
- Plant: spring or early fall
Hardiness
USDA hardiness zones: 2–7
Temperature: down to -46°C
Troubleshooting
A healthy Norway spruce hardly ever throws you a curveball, and most trouble that does crop up starts with a stressed or crowded tree. Keep watch on the top shoot and the inner needles, since that is where the first clues fire off. Match what you spot below, then jump in before a setback spreads.
Dead top shoot bending into a shepherd's crook
Catch that hooked, wilting top shoot early and you can turn it right around, because the culprit is the white pine weevil, whose larvae bore down inside the leader and kill it. Cut the dead leader out below the damage in mid to late spring, beating the adults before they chew free, then train one upright side shoot to charge upward as the new top. Scan for Cytospora canker too, since it strikes a branch or leader with much the same dieback whenever the weevil is off the hook.
Fix:
- Prune out and destroy the infested dead leader below the damage in mid to late spring before adults emerge
- Train an upright side shoot to become the new leader
- Maintain tree vigor with adequate water and mulch
Inner needles flushing purple-brown and dropping bottom up
Spot the older inner needles flushing purple-brown and dropping as the damage climbs from the lowest branches, and you have likely caught Rhizosphaera needlecast or a cousin fungus moving in on a stressed tree. Grab a hand lens and the story jumps out: rows of tiny black fruiting bodies on the cast needles, where healthy ones show off neat white waxy dots. Fight back by opening the canopy for airflow, watering right at the base, and cutting out the worst branches, since drought and root stress only fuel the trouble.
Fix:
- Improve air circulation by spacing and removing competing vegetation
- Avoid overhead irrigation and wetting foliage
- Remove and destroy heavily infected branches
- Maintain consistent soil moisture and mulch
Stippled, bronzing needles laced with fine webbing in spring and fall
Stippled, bronzed needles wrapped in fine webbing flag the spruce spider mite, a pest that gets busy in the cool weather of spring and fall. Nail down the diagnosis fast: tap a branch over white paper and watch the tiny specks scramble. Blast the mites off with a strong jet of water first, bring in horticultural oil only when their numbers surge, and steer well clear of broad-spectrum sprays that take out the predators standing guard over your tree.
Fix:
- Spray foliage with a strong jet of water to dislodge mites
- Apply horticultural oil or an approved miticide when populations are high
- Avoid broad-spectrum insecticides that kill mite predators
Toxicity
Cheerful news for homes with pets and kids: Norway spruce is not toxic. The one real hazard is mechanical, since the needles are stiff and sharp enough to prick skin, and a mouthful of swallowed needles might stir up a passing stomach upset. Nothing about the tree will poison a cat, dog, or curious child.
Safe for
People · Cats · Dogs · Horses · Rabbits · Livestock · Birds
Cats None
Great news, since there is no poison here at all. A cat that bats at or nibbles the needles might drool or paw at its mouth from those sharp tips, and that mild fuss is the whole story.
Dogs None
A dog can romp right alongside this tree. The stiff needles can scratch a curious nose, and a swallowed mouthful may spark a brief stomach upset, but real poison never enters the picture.
Horses Safe
Horses face no toxic browse in this tree. They tend to skip the prickly foliage anyway, and a stray taste does zero harm.
Rabbits Safe
Rabbits can share the garden with this tree and thrive, since the needles pack nothing poisonous to them.
Livestock Safe
Cattle, goats, and sheep run no risk of poisoning from the foliage. Some conifers spell herd trouble, but spruce keeps clear of that danger list.
Birds Safe
Birds win big here, gaining both cover and seed from the branches, and nothing about the tree is toxic to them.
People Safe
No poison worries for people either. The sharp needles can prick bare skin, so grab fresh branches with a little care, but the tree itself stays non-toxic.
Needles are stiff and prickly and can poke skin; ingested needles may cause mild mouth or stomach irritation or, in quantity, GI obstruction, so discourage chewing.
Varieties
Beyond the towering species tree, Norway spruce has fired off a whole run of distinct cultivars, from weeping giants to snappy little dwarfs. These are the ones worth knowing by name.
'Pendula'
This dramatic weeper sends its branches pouring straight down, so stake it upright for a bold accent or turn it loose to sprawl as a ground cover.
'Nidiformis'
The charming bird's nest spruce is a slow dwarf that holds to just a few feet, its flat top dipping into a nest-like hollow smack in the center.
'Acrocona'
This small, irregular, often semi-weeping tree steals the scene with bright red-pink young cones lighting up its branch tips.
'Cupressina'
A sleek narrow column of upswept branches, it throws off snow load and packs a tall screen into the tightest spot.
How to propagate
How you crank out more Norway spruce hinges on your goal: the wild species comes true from seed, while the prized weeping and dwarf forms have to be cloned to hold their shape.
SeedModerate
Sow stratified seed in spring · 2 to 4 years to a transplantable seedling
Chasing the true species instead of a named cultivar? Sow seed, since cultivars refuse to come true this way. Hand the seed about a month of cold, moist stratification before you sow in spring, then settle in for the wait, because it takes 2 to 4 years to raise a seedling big enough to transplant.
GraftingDemanding
Late winter under cover · 1 to 2 years
Grafting is the trick that keeps dwarf and weeping cultivars like 'Pendula' and 'Nidiformis' true to type, worked onto seedling rootstock in late winter under cover. It takes real skill, but pull it off and the graft knits and grows on within 1 to 2 years.
LayeringModerate
Spring · 1 to 2 years to root
Prostrate and weeping forms practically do the work for you, layering wherever low branches rest on the soil and root where they touch. Peg one down in spring and it will root over 1 to 2 years, ready to cut free and move once it settles in.
Myths
Norway spruce and Colorado blue spruce are basically interchangeable.
Look-alikes they may be, but they swap in for each other far less easily than you would guess. Norway spruce grows faster, takes heat and all kinds of sites in stride, and brushes off Rhizosphaera needlecast and Cytospora canker far better than blue spruce. For a tougher, longer-lived landscape tree, Norway spruce wins hands down.
Spruce Christmas trees are poisonous to cats and dogs.
Toss out the poison scare, because spruce is not a true toxin. Chewed needles are at most mildly or mechanically irritating to the mouth and stomach, so the genuine concerns come down to a passing stomach upset or, in quantity, a blockage. The real danger is the sharp, indigestible needles, not poison.