How to Grow Techny Green Arborvitae
Wikimedia Commons
Techny Green Arborvitae
Thuja occidentalis 'Techny'
shrubTechny Green Arborvitae is a dense, narrow, columnar evergreen shrub prized for its cold hardiness and vibrant green foliage year-round. It maintains an attractive pyramidal shape with minimal pruning and grows at a moderate pace. This cultivar is exceptionally winter-hardy and widely used as a windbreak, screen, or accent plant in northern climates.
When should you plant Techny Green Arborvitae 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 Techny Green Arborvitae timeline · Pittsburgh, PA (Zone 6b)
-
Plant Techny Green Arborvitae
Around Apr 17Near Pittsburgh's average last spring frost.
-
Tend & protect
Late spring–summerWatering, feeding, and pest-watch reminders.
-
Harvest Techny Green Arborvitae
Late summer into fallBefore the first fall frost (≈ Nov 8)
Sample dates for Pittsburgh, PA. Sign up to get exact Techny Green Arborvitae dates for your own zip code.
Growing Conditions
Soil
Growing Zones
Find your zone →Thrives in zones 2-7, exceptional cold hardiness makes it ideal for northern regions
Sign up free to see if Techny Green Arborvitae grows in your zone — and get a personalized planting timeline.
Get my Techny Green Arborvitae timeline →Growth Stages
Establishment (Year 1)
3-6 monthsYoung plant is settling into the landscape with active root development. Foliage may appear slightly stressed after transplanting but recovers quickly.
Water deeply 2-3 times weekly, apply 2-3 inches of mulch around base (keep away from trunk), avoid fertilizing in first year, provide shelter from harsh winds if transplanted in fall
Vegetative Growth (Years 2-3)
2-3 yearsPlant develops a full, dense branching structure. New terminal growth extends the height and fills out the columnar form. Foliage deepens to rich green.
Water during dry periods, light pruning to shape if needed, apply balanced slow-release fertilizer in spring, maintain 2-3 inch mulch layer, no major pruning required
Mature Growth (Years 4+)
OngoingPlant reaches full columnar form and maximum density. Exhibits characteristic narrow, pyramidal silhouette with fine, feathery foliage.
Water during extended drought, minimal pruning except to remove dead branches or maintain shape, annual light fertilization optional, monitor for pests and disease, allow winter snow to fall naturally without shaking branches excessively
Companion Planting
Plan your garden →Plant with:
Avoid planting near:
Common Pests
-
Hand-pick egg cases in winter, apply insecticidal spray in late spring when caterpillars emerge, use Bacillus thuringiensis (Bt) for organic control
-
Spray with strong water stream to dislodge, use horticultural oil or neem oil in spring and fall, maintain adequate moisture to reduce stress
-
Prune out affected shoots, apply insecticidal spray in late spring, maintain plant health to reduce susceptibility
-
and
(fungal)
Ensure excellent drainage, avoid overwatering, prune dead branches, apply fungicide if cankers appear, consider removal if severely affected
-
Install physical barriers or deer fencing, apply commercial deer repellent sprays, plant in areas with natural protection
Uses
Winter Windbreak & Privacy Screen
HouseholdIts dense, narrow columnar form makes it ideal for creating windbreaks and living privacy screens in cold climates. A row of Techny cultivars provides year-round visual screening and reduces wind penetration. [source]
Wildlife Shelter & Nesting
WildlifeDense foliage provides excellent shelter and nesting habitat for birds and small mammals, particularly valuable in harsh northern winters. [source]
Ornamental Landscaping
CraftIts attractive, consistent pyramidal shape and vibrant green foliage make it a premium choice for formal gardens, entrances, foundation planting, and specimen use without requiring intensive shaping or maintenance. [source]
Cold Hardiness & Reliability
HouseholdBred specifically for extreme cold tolerance (zone 2), Techny Green is one of the most reliable arborvitae cultivars for northern gardeners, withstanding temperatures well below -40°F. [source]
Traditional Uses of Arborvitae
MedicinalWhile not commonly used in modern herbalism, arborvitae has a history in traditional medicine and contains thujone, though consumption is not recommended due to potential toxicity. [source]
This is not medical advice. LizPlants is not a medical resource. Always consult a qualified healthcare professional before using plants medicinally.
Harvest Tips
Techny Green Arborvitae is an ornamental shrub, not harvested for food or material. Prune minimally for shape; remove any dead, diseased, or damaged branches in late winter before spring growth. Light shaping can be done in early summer to maintain columnar form.
Fun Facts
- 🌱 Techny Green was specifically developed by the University of Minnesota and cultivated at the Cass Nursery to withstand the brutal winters of Minnesota and surrounding regions, earning its name 'Techny' from the original Techny (now Kishwaukee College) area.
- 🌱 Arborvitae is also known as 'white cedar' despite not being a true cedar; the name comes from French meaning 'tree of life' and dates back to its use by Native Americans for medicinal remedies.
- 🌱 This cultivar retains its bright green color throughout winter better than many other arborvitae varieties, which often take on bronze or brownish tones in cold weather.
Gardening Terms
New to gardening? Learn about terms used in this guide:
Join 30,000 gardeners planning their gardens with LizPlants.
Get your personalized Techny Green Arborvitae planting timeline
Tell us your zip code and we'll calculate exactly when to start Techny Green Arborvitae 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 Techny Green Arborvitae timeline →