Tree · Cupressaceae
Sawara False Cypress
Chamaecyparis pisifera
Set it in full sun and free-draining soil, and false cypress keeps its color firing through every season.
Full sun
Every 7–14 days
USDA 4–8
20–30 ft · 6.1–9.1 m
Overview
Sawara false cypress is a hardy evergreen conifer out of Japan, grown for its soft, feathery foliage instead of any bloom. It rides with the cypress family and laughs off cold down to -29°F (-34°C), which keeps it a staple in northern gardens across USDA zones 4 to 8. Left to its own devices the species shoots up into a tall tree, but most gardeners reach for the smaller named forms.
The named cultivars are where this plant really pays off. Some stay as low golden mounds, others rise into soft blue-green columns, and the threadleaf types spill out in weeping strands of yellow. That spread lets it pull duty as a foundation shrub, a standout specimen, or a jolt of winter color once the rest of the garden has gone bare.
It asks for next to nothing once it settles in. Give it sun, soil that drains, and a buffer from the worst drying wind, and it keeps its year-round color with hardly any fuss. The one rule that catches people out is pruning, since this conifer will not regrow from bare wood.
Care
The short version: full sun to part shade, set in moist but well-drained soil that never turns soggy, with light pruning kept strictly to green growth and a balanced evergreen feed come spring.
Light
False cypress colors up strongest in full sun, where the gold and blue forms fire off their brightest tones. It handles partial shade too, though skimp on light and the foliage thins out and those colors go flat.
Water
Keep the soil moist but never waterlogged, soaking it deep while the plant digs in and through any dry stretch. Once established it shrugs off a fair run of drought, yet it still wants sharp drainage, since standing water is what kicks off root rot.
Soil
Set it in moist, fertile, well-drained ground. It stays easygoing about chemistry and copes with anything from acidic to slightly alkaline, roughly a pH of 5.0 to 7.5, as long as the water drains off freely.
Temperature
This is a tough, cold-hardy conifer, happy from about -29°F to 86°F (-34°C to 30°C). It powers through hard northern winters, though biting, dry wind can scorch the side that's out in the open.
Humidity
Plain outdoor humidity suits it fine, so skip chasing any number. Air movement carries far more weight, since crowded, still, damp foliage is exactly where blight and mites take off.
Feeding
Feed it lightly in spring with a balanced slow-release fertilizer built for evergreens. One seasonal feeding does the job, since this is a slow, steady grower that doesn't want pushing.
Pruning
Keep pruning light and shape it only while green growth holds. The firm rule: never cut into bare brown wood, which carries no dormant buds and will not refill. Clearing dead interior branches as the plant ages keeps it crisp and tidy.
Repotting
Container and dwarf forms want a fresh, roomier pot every 2 to 3 years. Roots looping the pot, water tearing straight through, or growth that has stalled all signal it's time to size up.
Size & spacing
Size hangs entirely on the form you pick. The species can shoot to 20 to 30 feet (6 to 9 m) tall and spread anywhere from 3 to 20 feet (90 cm to 6 m), so read the label and hand each plant the room its variety calls for.
When to plant
False cypress is a hardy conifer that drops straight into the ground rather than a seed tray. Get it planted in spring or early fall while the soil is warm and the moisture stays steady, handing the roots time to dig in before summer heat or hard winter cold rolls through. No bloom or harvest to count down to, since it earns its keep with year-round foliage.
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
Hardiness
USDA hardiness zones: 4–8
Temperature: down to -34°C
Troubleshooting
Nearly every false cypress hiccup traces to wet feet, dry wind, or a bad pruning cut. Spot the early signs on the tips, across the foliage, or down in soggy soil, and you can jump in before a branch is lost. Match what you're seeing below, then move while it still counts.
Steady fade and thinning foliage in wet ground
A plant that thins and dulls in wet ground is nearly always battling root rot, often Phytophthora. Dig down and you'll turn up dark, mushy roots where firm white ones should sit. A badly rotted plant won't bounce back, so sharpen the drainage, ease off the water, and replant only where it runs off fast.
Fix:
- Improve drainage immediately and stop overwatering
- Remove severely affected plants
- Replant only in well-drained soil
Tips browning out and dying back on you
When the tips brown and die, point your suspicion at tip blight, a fungus that pounces on young or stressed shoots during wet stretches. Dry winter wind throws the same browning onto the sun-facing side. Cut the hit twigs well below the damage, wipe your tools clean between cuts, then open up the airflow and screen the plant from rough wind.
Fix:
- Prune out and destroy blighted twigs well below symptoms, disinfecting tools between cuts
- Improve air circulation and avoid overhead watering
- Shelter plants from harsh drying winter wind
Stippled, bronzed foliage strung with fine webbing
Fine webbing and a dull, speckled look give away spider mites, which pile onto dusty, stressed plants fast. Tap a branch over white paper and watch them scatter. Bagworms drop a different hint, little spindle-shaped bags dangling off the foliage. Blast the mites off with water, pluck the bags by hand, and hit young bagworms with Bt as the crawlers show up in early summer.
Fix:
- Hose down foliage to dislodge mites
- Hand-pick and destroy bagworm bags
- Treat young bagworms with Bacillus thuringiensis (Bt) when crawlers are active in early summer
Bare brown wood that stays bare for good
Cut a false cypress into the bare brown wood at its core and that patch stays dead, because old wood keeps no dormant buds to fire off fresh shoots. Some inner browning is just age catching up, as shaded lower limbs fade out over the years. Prune into green, foliage-bearing growth only, and clean out dead interior wood for the look while you accept it won't fill back in.
Fix:
- Prune only into green foliage-bearing growth
- Remove dead interior wood for appearance, accepting it will not refill
Toxicity
Great news for homes full of animals: false cypress lands as not considered toxic. It stays off the ASPCA poison lists, and it counts as safe around cats and dogs. As with any plant, a pet that gulps down a lot of foliage might hit a brief stomach upset, but no real poison waits for you here.
Safe for
People · Cats · Dogs · Horses · Rabbits · Livestock · Birds
Cats None
Keep cats around it with confidence, since false cypress sits off the ASPCA toxic list. A cat that chews through plenty of foliage might land a short stomach upset, just like with loads of garden plants.
Dogs None
Dogs have nothing to fear here. The foliage carries nothing toxic, though a big bite could leave a curious pup queasy for a moment.
Horses Safe
Rated safe around horses, with no toxic compounds turning up in the foliage.
Rabbits Safe
Rabbits can browse nearby without trouble. It's no known poison, so a stray nibble does them no harm.
Livestock Safe
Cattle, goats, and sheep grazing close by run no real risk from this conifer, which packs no toxins worth flagging.
Birds Safe
Backyard and wild birds do well around it, and the dense evergreen cover gives them solid shelter instead of any threat.
People Safe
Nothing toxic to people, though the foliage isn't food and the trimmings can feel a touch resinous on your hands.
An outdoor landscape conifer; foliage may cause mild stomach upset if large amounts are chewed, as with many plants, but it is not considered toxic.
Varieties
Almost nobody plants the full-size species. These are the named forms and close relatives you'll actually run into at the nursery.
'Gold Mop' / 'Golden Mop'
A favorite dwarf threadleaf form whose stringy, mop-like foliage blazes bright golden-yellow, sitting around 2 to 3 feet (60 to 90 cm) tall and wide at 10 years before easing up to about 5 feet (150 cm).
'Boulevard'
A soft, feathery moss form with blue-green to silvery juvenile foliage that climbs to roughly 5 to 6 feet (150 to 180 cm) in 10 years and tops out near 12 feet (3.7 m).
'Filifera Aurea'
A golden threadleaf form whose weeping branches trail thread-like yellow foliage, hitting 6 to 7 feet (180 to 215 cm) in 20 years and stretching to roughly 20 feet (6 m) in time.
Hinoki cypress (Chamaecyparis obtusa)
A separate relative species you can spot by its flatter, fan-like sprays of fragrant scale foliage, a clear break from the Sawara's threadlike strands.
Atlantic white cedar (Chamaecyparis thyoides)
A North American relative at home in wet, boggy ground, standing apart from the Japanese Sawara false cypress.
How to propagate
How you multiply false cypress comes down to your goal. Cuttings copy a prized gold or blue form exactly, while seed hands you the plain species and a grab bag of seedlings.
Stem cuttingsModerate
Mid to late fall · Several weeks to months to root
Cuttings are your go-to for copying the named gold and blue forms, which won't come true from seed. Take them in mid to late fall and stay patient, since they may need several weeks to months to push roots.
SeedModerate
After cone ripening · Slow; seedlings variable
You can raise the straight species from seed sown after the cones ripen, just expect slow, uneven results. The seedlings differ from one another and won't carry the traits of a named cultivar.
Myths
You can shear false cypress hard like a hedge and it will fill back in from the bare wood.
Like most needled evergreens, false cypress keeps no dormant buds on its old brown wood. Slice into that bare interior and the gap stays open for good. Prune only into green growth and shape the plant in small steps over time.
False cypress is poisonous to cats and dogs.
Chamaecyparis stays off the ASPCA toxic-plant lists. It is regarded as non-toxic to cats and dogs, though a pet that chews through a lot of any plant can land a mild, passing stomach upset.