Tree · Cupressaceae
Japanese Cedar
Cryptomeria japonica
Give it rich, moist soil and shelter from winter wind, and Japanese cedar rises as a towering evergreen spire that anchors the whole garden.
Full sun
Every 7–14 days
USDA 5–9
50–70 ft · 15.2–21.3 m
Overview
Japanese cedar carries a sense of place. As the national tree of Japan, where it is known as sugi, it lines temple grounds in tall, composed rows that lend a scene calm and formality. In a garden that same stately, upright presence draws the eye down a path or frames a distant view, softened by feathery, awl-shaped needles that keep it from ever feeling severe.
Give it room and it becomes the defining vertical of a landscape. At full stretch it reaches 50 to 70 feet (15 to 21 m) with a broad pyramidal crown, and the reddish-brown bark peels in long, shaggy strips that add warmth and texture to a winter view. Hardy to -20°F (-29°C) across USDA zones 5 to 9, it holds its color and shape while the rest of the garden sleeps.
Most gardeners look to the named cultivars to match the tree to the setting. A rounded dwarf settles neatly beside a bench or a small courtyard bed, while a full-size selection screens a boundary or grounds a large lawn. Whatever the scale, it asks only for steady moisture and a corner out of the sharpest wind, then quietly holds the space it is given.
Care
The short version: give it full sun to light shade, rich, moist, acidic, well-drained soil that never dries out, and a sheltered spot away from harsh, drying winter wind.
Light
Japanese cedar looks its best in full sun, where the canopy fills out dense and even for a clean silhouette. It accepts partial sun or light shade, though a shadier corner leaves the growth thinner and more open.
Water
Keep the soil consistently moist, above all while the tree is young, and never let it dry out. Watering every 7 to 14 days suits most gardens, and an established tree carries a brief dry spell with ease. What it will not forgive is a real drought.
Soil
Give it rich, deep, moist, well-drained loam on the acidic side, ideally a pH of 5.0 to 6.5. The soil should hold moisture without turning waterlogged, so blend in organic matter on heavy or thin ground before planting.
Temperature
This is a resilient tree, hardy from -20°F to 100°F (-29°C to 38°C) across USDA zones 5 to 9. It carries both summer heat and deep winter cold with grace, though drying winter wind marks the foliage more than the cold itself.
Humidity
Average outdoor humidity is all it asks, so there is no figure to watch. Steady soil moisture is what counts, far more than anything the air is doing.
Feeding
Feed in spring with a balanced or acid-forming slow-release fertilizer made for evergreens. Once a season keeps a healthy tree in good form, and heavier feeding only invites soft, weak growth that spoils the line.
Pruning
Japanese cedar wants little pruning to look its best. Clip out any dead, damaged, or winter-burned shoots in spring, and that is generally all the tree asks. It also shears cleanly, which makes it a natural for a formal screen or hedge.
Repotting
Most Japanese cedars grow in the ground and never need repotting. For one kept in a container to frame an entrance or terrace, repot rarely, and let roots circling the pot, water rushing through, or stalled growth be your signal.
Size & spacing
Plan for a tree that reaches 50 to 70 feet (15 to 21 m) tall with a spread of 20 to 30 feet (6 to 9 m). Allow that generous clearance from buildings and neighbors, or scale down to a dwarf cultivar where the setting is more intimate.
When to plant
As an evergreen conifer, Japanese cedar keeps no sowing season and offers no harvest to wait on, only a steady year-round presence. Plant it in spring or early fall, while the soil is warm and moisture reliable, so the roots settle through a mild stretch before they meet high summer or deep winter.
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
- Harvest: Non-flowering; grown for evergreen foliage and form (cones mature in fall)
Hardiness
USDA hardiness zones: 5–9
Temperature: down to -29°C
Troubleshooting
Japanese cedar is an easy, low-maintenance tree, and the few issues it meets tend to surface in the foliage. Most are cosmetic and pass with the season, leaving its form untouched. Match what you see below before deciding whether anything is worth doing.
A bronzed, scorched cast to the winter foliage
In most gardens this is simply winter bronzing, a seasonal shift in color that many cultivars pass through before returning to green in spring. The effect gathers on the windward side, where drying winter wind draws moisture from the needles faster than frozen roots can restore it. Set the tree in a sheltered corner of the garden, carry it into winter with moist soil, and remove any shoots that stay brown once the season turns.
Fix:
- Site plants where they are sheltered from harsh, drying winter winds
- Keep soil adequately moist going into winter
- Prune out shoots that fail to green up in spring
Spotted needles with a little dieback at the tips
This is usually the work of leaf spot and leaf blight fungi, Cercospora and Pestalotiopsis among them, which favor the quiet, damp air of the lower interior branches. They tend to arrive when a tree is under strain, so a plant coping with a difficult corner or a dry stretch is the one that shows it. Trim away the marked twigs, open the canopy so the air can circulate, and keep the tree in good form, since the blemish is one of appearance rather than health.
Fix:
- Prune out and dispose of affected twigs and foliage
- Improve air circulation and avoid overhead wetting of foliage
- Maintain plant vigor with proper siting, water, and nutrition
Toxicity
There is comfort here for households with pets: Japanese cedar is not toxic. It appears on no poison list, and animals can share the garden with it in safety. The only thing to keep in mind is the foliage itself, since the needles are stiff and sharply pointed.
Safe for
People · Cats · Dogs · Horses · Rabbits · Livestock · Birds
Cats None
A cat can share the garden with this tree in comfort, as it holds no known toxin. Should one sample the foliage, the most you might see is a little drooling or a passing stomach upset, no different from any coarse greenery.
Dogs None
A dog is entirely at ease around Japanese cedar, which belongs on no poison list. A sprig chewed from the ground may bring a brief, mild spell of stomach trouble and little else.
Horses Safe
Horses face no toxic threat from this tree in the landscape. Its stiff, awl-shaped needles are unwelcoming, so most give it a wide berth regardless.
Rabbits Safe
Rabbits are in no danger from this conifer, with no harmful compound on record. The prickly foliage seldom invites a nibble in the first place.
Livestock Safe
Cattle, goats, and sheep may graze alongside it with no threat of poisoning. The sharp, resinous needles make it an unlikely mouthful to begin with.
Birds Safe
Birds take no harm from the tree and often nestle into its dense evergreen cover. Neither the foliage nor the cones hold anything toxic to them.
People Safe
Japanese cedar is safe for people to plant and handle, though the pointed needles can prick bare skin. With no edible part to offer, it earns its place through shade and screening rather than the table.
Foliage is harmless to handle, though needles are sharply pointed and awl-shaped.
Varieties
The straight species grows large, so the art is in choosing a cultivar that suits the room you have. These are the forms you will meet most often when you shop.
Yoshino
A vigorous, fast grower to about 30 to 40 feet whose blue-green foliage keeps its color through winter with far less bronzing, a graceful choice for a year-round focal point.
Black Dragon
A dwarf clothed in very dark green foliage held in an upright, dense, slightly ragged pyramid that lends quiet structure to a bed.
Globosa Nana
A slow, rounded dwarf shrub of about 2 to 4 feet whose bluish-green needles warm to a rusty-red cast in winter, a soft note for the cold season.
Sekkan-sugi
Prized for the creamy-yellow new growth that lights up the branch tips and brings a brighter accent to a green corner.
Radicans
A fast, narrow pyramid in rich blue-green that reads as an elegant living screen along a boundary.
How to propagate
Japanese cedar takes to seed, cuttings, or layering, and the method you favor depends on whether you want a faithful copy of a named cultivar or simply more trees for the garden.
SeedModerate
Sow in fall or spring after cold stratification · Several months to germinate; years to reach landscape size
Seed offers the slow, patient route: sow in fall or spring after a cold stratification and allow several months for germination, with years more before the trees reach landscape size. Because the seedlings vary, a named cultivar will not come true from seed.
Stem cuttingsModerate
Semi-hardwood cuttings in late summer to fall · Several weeks to months to root
For a faithful copy of a named cultivar, cuttings are the elegant answer. Take semi-hardwood cuttings from late summer into fall, dip them in rooting hormone, and hold them in humid conditions while they root across the following weeks to months.
LayeringModerate
Spring · One or more seasons
Layering suits the unhurried gardener, since low branches root where they meet the soil. Pin one down in spring, let it form its own roots, and wait a season or more before parting it from the parent.
Myths
Japanese cedar is a true cedar.
For all that the name suggests, this tree claims no kinship with the true cedars of the genus Cedrus. Cryptomeria keeps a genus of its own within the cypress and redwood family, Cupressaceae. The common name is a matter of tradition, not taxonomy.