Lawson Cypress Bonsai Care

Chamaecyparis lawsoniana

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Zones 5 to 9, outdoor only. A tall western North American false-cypress (also called Port Orford Cedar) with soft, ferny. Most are lost to overwatering.

Cupressaceae (cypress family) · Evergreen coniferous tree

At a glance

Type: Conifer
Leaves: Evergreen
USDA zones: 5 to 9
Indoor or outdoor: Outdoor
Growth rate: Moderate
Bonsai popularity: Tier 3

Close-up photo reference

Compare your tree against these to confirm the species and spot problems early.

Lawson Cypress cones — **Cone**, Rosser1954 · CC BY-SA 4.0

Lawson Cypress quick reference

USDA zones	5 to 9
Indoor / outdoor	Outdoor only: full sun, shelter from wind
Light	Full sun: shade browns inner/lower foliage
Water	Moist: never dry, but very prone to root rot if waterlogged
Soil	Free-draining yet moisture-holding mix
Repot	Every 2 to 3 years (young), 4 to 6 (older), spring
Frost	Hardy; shelter from cold drying wind
Mature height	130 to 195 ft (40 to 60 m) wild; 12 to 28 in (30 to 70 cm) as bonsai
Growth rate	Moderate; weak on bare old wood
Season of interest	Year-round soft scale foliage sprays
Leaf reduction	Scale foliage refines with pinching, not cutting
#1 cause of death	Root rot from standing water; inner dieback (won't bud old wood)

Overview & Character

The Lawson Cypress is a tall western North American false-cypress (also called Port Orford Cedar) with soft, ferny, often blue- or gray-green foliage and many dwarf cultivars used for bonsai. It suits medium-to-large formal upright work and naturalistic conifer styles.

It shares the Chamaecyparis rules: it is thirsty and must not dry out, yet is very prone to root rot if left standing in water, so water generously in the morning with sharp drainage. And it will not back-bud on old bare wood, so keep full sun on the whole canopy and never cut past green foliage; shape by clip-and-grow.

Identification

Foliage: Fine scale leaves in flattened, drooping ferny sprays, often blue-gray or gray-green, with whitish X-marks beneath; aromatic (parsley/resin scent) when crushed.

Bark & trunk: Reddish-brown, fibrous and shredding in vertical strips.

Growth habit / form: Tall, conical, with soft drooping foliage sprays and a nodding leader; suits medium/large formal upright and naturalistic styles.

Flowers / fruit: Monoecious; small round cones ~1/4 to 3/8 in (7 to 9 mm) ripening brown.

Look-alikes & how to tell them apart: Close to other false-cypress; Lawson is told by its drooping, often blue-gray ferny sprays, parsley-scented foliage, and nodding leading shoot; Sawara has tiny pea cones and more pointed scales, Hinoki has blunt tight scales with white Y-marks.

Climate & USDA Zone

Hardy in USDA zones 5 to 9. Needs full sun and shelter from drying wind, grown outdoors year-round; protect from cold winter wind. Susceptible in the ground to Phytophthora lateralis root disease, so sharp drainage and clean practice matter. Not an indoor plant.

Light

Full sun: it is not very shade-tolerant, and in shade the lower and inner branches brown and die (irreversible, since it won't re-bud bare wood). Maximize light to keep the whole canopy alive and dense.

Watering

Keep moist: it needs a lot of water and likes moist soil, but it is very prone to root rot if left standing wet, especially overnight.

Water thoroughly, preferably early in the morning; do not let the soil dry out, and do not let it sit waterlogged.
Sharp drainage with a moisture-holding component is the balance to strike.

Soil & Root Care

Soil: A well-draining yet moisture-retentive mix: e.g. 1 part sharp sand : 1 part grit (1/4 to 3/8 in / 6 to 10 mm) : 1 part loam, or akadama/pumice/lava with a little organic matter.

Repotting:

Frequency: young trees every 2 to 3 years (fast roots); older every 4 to 6 years.
Timing: spring as growth starts.
Moderate root-pruning; keep some old soil; use clean tools (root disease risk).
Aftercare: keep moist, sheltered from wind/sun while recovering.

Feeding

Apply a balanced organic feed (liquid every ~2 weeks, or granular every couple of months) from spring to mid-summer and again from late summer to late autumn. Don't feed freshly repotted trees.

Pruning & Styling

Clip-and-grow; pinch green foliage only. It will not back-bud on old bare wood, so never cut a branch back past its green foliage.
Prune the leading tips regularly so shoot tips lignify and light reaches deeper into the crown, keeping inner foliage alive.
Wiring: branches are workable; protect the shredding bark; much shaping is directional pruning.
Best suited to medium-to-large formal upright bonsai.

Seasonal Calendar

Spring: Repot if due (as growth starts, clean tools); resume feeding; full sun; pinch tips.
Summer: Water well in the morning (never dry, never standing wet); watch spider mites; clip-and-grow.
Autumn: Second feeding window (late summer to autumn); light shaping.
Winter: Shelter from cold drying wind; keep moist, not soggy.

Care calendar by month

Northern Hemisphere. In the Southern Hemisphere, shift every month by six.

Repot and root-prune: April
Prune, wire and shape: May, October to November
Feed: April to June, September to October
Air-layer or take cuttings: June to July

Propagation & Cuttings

Ease: Easy (roots from cuttings). Best method: cuttings.

Chamaecyparis lawsoniana is propagated from cuttings: the many cultivars are cloned this way. Take semi-hardwood heel cuttings in autumn to late winter, dip in IBA, keep humid and cool; rooting is reliable but slow. Seed germinates after short cold stratification but seedlings vary. It doesn't layer readily. For bonsai, cuttings keep the chosen foliage color and form; like Hinoki it back-buds poorly on bare old wood, so never strip interior growth when styling.

Pests

Spider mites (hot, dry conditions)
Scale insects
Aphids
Bagworms

Treat with horticultural oil, insecticidal soap, or appropriate systemics; catch infestations early.

Disease, Fungus & Infection

Root rot (Phytophthora, incl. P. lateralis): from standing water/poor drainage; the leading killer, and Lawson is notably susceptible.
Inner/lower foliage dieback: from shade or over-cutting (cultural; irreversible: won't re-bud bare wood).
Tip blight: shoot dieback in wet, humid, low-airflow conditions; prune out, improve airflow.

Prevention: morning watering with sharp drainage, full sun, airflow, clean tools, wind shelter.

Most Common Causes of Death

1. Root rot from standing water. Especially overnight wetness; water in the morning and keep sharply drained. 2. Inner/lower foliage dieback. From shade or hard cutting; keep full sun and never cut past green foliage. 3. Drying out. It must not go dry; water faithfully. 4. Cold drying wind. Shelter in winter. 5. Spider mites on a stressed tree. Keep vigor up; treat early.

Sources

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European Cypress Evergreen Bonsai, 7 Years Old (Chamaecypari iawsoniana 'Ellwoodii'), $45.95 + $14.95 shipping

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