How to Grow Lawson Cypress Stewartii
Wikimedia Commons
Lawson Cypress Stewartii
Chamaecyparis lawsoniana 'Stewartii'
treeStewartii is a narrow, columnar cultivar of Lawson Cypress featuring distinctive golden-yellow foliage that brightens to chartreuse in summer and deepens in winter. This evergreen conifer grows slowly and maintains its elegant, pencil-like shape without regular pruning. It's prized as an ornamental specimen tree and accent plant in temperate gardens.
When should you plant Lawson Cypress Stewartii in your zone?
Get a personalized planting timeline — when to start seeds, transplant, and harvest — based on your USDA zone and local frost dates. Free to start.
Example Lawson Cypress Stewartii timeline · Pittsburgh, PA (Zone 6b)
-
Plant Lawson Cypress Stewartii
Around Apr 17Near Pittsburgh's average last spring frost.
-
Tend & protect
Late spring–summerWatering, feeding, and pest-watch reminders.
-
Harvest Lawson Cypress Stewartii
Late summer into fallBefore the first fall frost (≈ Nov 8)
Sample dates for Pittsburgh, PA. Sign up to get exact Lawson Cypress Stewartii dates for your own zip code.
Growing Conditions
Soil
Growing Zones
Find your zone →Thrives in zones 5b-8b; prefers mild maritime climates
Sign up free to see if Lawson Cypress Stewartii grows in your zone — and get a personalized planting timeline.
Get my Lawson Cypress Stewartii timeline →Growth Stages
Establishment
First 1-2 yearsYoung transplant with feathery, fine-textured golden foliage; narrow, upright form beginning to establish
Water regularly to keep soil consistently moist but not waterlogged. Mulch around base to retain moisture and regulate temperature. Avoid transplant shock by protecting from strong winds during first season.
Young Growth
Years 2-5Tree develops tighter columnar shape; foliage becomes more compact and densely branched; golden-yellow color becomes more prominent
Maintain consistent moisture. Remove any dead or crossing branches. Light pruning can encourage denser form if desired, but tree naturally grows narrow. Watch for spider mites in dry conditions.
Mature Development
Years 5-15+Full columnar form achieved; can reach 15-25 feet tall with 3-6 feet width; foliage color deepens slightly in winter, brightens in summer
Prune selectively to maintain shape if needed, but avoid cutting into old wood. Fertilize minimally—use balanced, slow-release formulation if needed. Monitor for branch dieback or disease.
Long-term Maintenance
15+ years onwardEstablished specimen tree at full mature height with stable form; foliage may show seasonal color shifts from golden-yellow to bronze-green
Prune only to remove dead or diseased wood. Maintain deep watering during extended droughts. Monitor for Phytophthora cinnamomi (root rot) in overly wet sites. Annual light raking of debris helps prevent fungal issues.
Companion Planting
Plan your garden →Plant with:
Avoid planting near:
Common Pests
-
Increase humidity via misting; spray foliage with water to dislodge; use insecticidal soap or miticide if severe. Avoid water stress which increases susceptibility.
-
Maintain tree vigor through proper watering and care; remove infested branches promptly; no effective chemical control once established.
-
Handpick bags in late fall/winter before moth emergence; apply Bacillus thuringiensis (Bt) to young caterpillars in spring.
-
Prevention is key: ensure excellent drainage, avoid overwatering, improve soil aeration. Remove infected trees. Use resistant rootstocks when available.
Uses
Specimen Tree & Vertical Accent
OrnamentalThe narrow columnar form and golden-yellow foliage make Stewartii an exceptional focal point or accent planting in small to medium gardens. Ideal for creating vertical interest in confined spaces, foundation plantings, and formal landscapes. [source]
Seasonal Color Interest
OrnamentalFoliage color shifts throughout the year—brightest golden-yellow in spring and summer, deepening to bronze-green or copper tones in winter cold. This dynamic color changes provide year-round visual interest. [source]
Windbreak & Privacy Screen
HouseholdWhen grouped or planted in rows, multiple Stewartii trees create an effective, narrow windbreak or privacy hedge without requiring large amounts of space. Dense foliage provides year-round screening. [source]
Shelter for Birds
WildlifeDense evergreen foliage provides protective cover and nesting habitat for songbirds and other wildlife. The tree's structure offers safe perching and roosting sites year-round. [source]
Harvest Tips
Not applicable; this is an ornamental tree grown for foliage and form. Prune selectively in late winter or early spring to remove dead or diseased wood. Avoid heavy pruning of old wood, as the tree does not regenerate well from interior cuts.
Fun Facts
- 🌱 Stewartii was selected and named at Stewart Nurseries in Nanaimo, British Columbia, where it was recognized as a superior golden form of Lawson Cypress in the mid-20th century.
- 🌱 This cultivar is native to a tiny region along the Oregon-California border; the wild species grows naturally only in that restricted area but has been successfully cultivated worldwide in suitable climates.
- 🌱 Unlike many conifers, Stewartii's golden foliage coloration is due to the presence of xanthophyll pigments year-round, not just in winter dormancy—making it a 'golden' cultivar rather than a seasonal color changer.
Gardening Terms
New to gardening? Learn about terms used in this guide:
Join 30,000 gardeners planning their gardens with LizPlants.
Get your personalized Lawson Cypress Stewartii planting timeline
Tell us your zip code and we'll calculate exactly when to start Lawson Cypress Stewartii seeds, transplant seedlings, and harvest — based on your USDA zone and local frost dates. Includes calendar reminders and printable task lists. Free to start.
Get my Lawson Cypress Stewartii timeline →