The illustrated growing guide
Eastern Hemlock
Tsuga canadensis
Family Pinaceae
Est. zones 3-7
The elegant, shade-loving native evergreen — soft feathery needles, graceful drooping habit, and the finest clipped conifer hedge you can grow. It needs cool, moist, sheltered spots and struggles in heat and wind. The honest warning: the woolly adelgid (look for white cottony dots under the needles) is killing wild hemlocks, so only plant where you'll watch for and treat it.
Part Shade to Shade
Moderate water
Slow-Moderate growth
Native to North America
From the print shop
Growing eastern hemlock? Hang it.
Our Evergreens collection carries eastern hemlock — Tsuga canadensis, print Nº 10, “Hemlock.”
16 designsfrom $21.99white or black groundmatte poster, unframed
I
Overview
Will eastern hemlock suit your garden, and what goes wrong.
Will it thrive where you are?
Enter your ZIP — we look up your USDA hardiness zone (2023 map) and check it against what eastern hemlock actually needs.
Hardy inZones 3-7Eastern Hemlock at a glance
Common eastern hemlock problems
- Hemlock Woolly Adelgid (the major threat — white cottony masses)
- Spider Mites in heat
- Needle Blight in poor air flow
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Growing
Light, water, soil, propagation and the season’s jobs.
How to grow eastern hemlock: light, water & soil
How to plant & propagate eastern hemlock
When to spray eastern hemlock
Dormant season. Horticultural oil for adelgid in fall/spring where present.
Growing season. Adelgid control (oil or systemic) is essential in infested regions — do not plant untended in adelgid country.
III
The year
What eastern hemlock asks for, month by month.
The eastern hemlock year, month by month
BloomPruneWhat each band means
- Bloom — flowers open — pollinators working, frost on blossoms is the danger.
- Prune — shape it now — cuts heal cleanly and structure is visible.
The eastern hemlock year as text
- Jan quiet month
- Feb pruning
- Mar bloom, pruning
- Apr bloom
- May bloom
- Jun quiet month
- Jul quiet month
- Aug quiet month
- Sep quiet month
- Oct quiet month
- Nov quiet month
- Dec quiet month
These are the species' typical months — expect them a few weeks earlier in warm zones and later in cold ones. Watch the plant, not just the calendar.
IV
Ecology & uses
What it does for the garden, and what it is grown for.
Eastern Hemlock in the garden system
- Canopy layer tree
What eastern hemlock is grown for
! Some parts toxic — see notesMildly toxic to livestock (needles); this is the tree, not the poison hemlock plant
Edibility, identification, and traditional-use notes here are general reference — not medical or veterinary advice, and not a claim that any plant treats or prevents anything. Medicinal ratings record how strongly a plant features in herbal tradition, nothing more. Never eat or dose a plant you have not positively identified. More on how to use this library.
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Cultivars
Named varieties of eastern hemlock, ruled as a catalogue.
Best eastern hemlock varieties & cultivars
Species; 'Sargentii' (weeping); dwarf cultivars for gardens
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Sources & plant ID
Where the care distinctions come from, and how the plant is filed.
Research basis
Sources behind this profile
No extension citations are attached to eastern hemlockyet. The care figures below come from the library's own catalogue rather than a traced primary source.
Plant ID
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Where to buy
Third-party nurseries — not Story Thyme Farms.
Third-party nurseries, not Story Thyme Farms. Prices are theirs.
Story Thyme Farms may earn a small commission from these links, at no cost to you — it never changes what we recommend.
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Questions
Eastern Hemlock questions, answered straight.
Is eastern hemlock safe for kids and pets?
With care. Mildly toxic to livestock (needles); this is the tree, not the poison hemlock plant Site it accordingly if children or pets roam the garden. This is general reference, not medical or veterinary advice — call a vet or poison control if something has actually been eaten.
How do you propagate eastern hemlock?
Seed (stratify), cuttings, or layering.
IX
Elsewhere
Where eastern hemlock sits in the library.
Black Locust
Sassafras
Northern Catalpa
American Sycamore