New Harmony American Elm
Ulmus americana 'New Harmony'
Essentials
At a Glance
Plant Type
Tree
Height
780 inches
Width
780 inches
Light
Full Sun
Zones
4, 5, 6, 7, 8, 9
Water
Medium
Humidity
Adaptable
Lifespan
Very long-lived (100+ years)
Native To
Eastern North America
Toxicity
Non-toxic
The Story
Plant Bio
The American Elm is a large, fast-growing deciduous tree, historically cherished for its graceful, arching, vase-shaped canopy that provided shade to countless city streets. 'New Harmony' is a U.S. National Arboretum introduction selected for its classic, broad vase shape and, most importantly, its high level of tolerance to Dutch elm disease, which allows for the return of this iconic tree to the American landscape.
Bloom Period:
Uses & Benefits:
Marketplace
Where to Buy
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Planting
How to Grow
- Choose a large, open site with full sun and well-drained soil.
- Dig a planting hole two to three times wider than the root ball.
- Set the tree in the hole so the root flare is at or slightly above grade.
- Backfill with the native soil, ensuring no air pockets remain.
- Water deeply and consistently for the first few years.
- Apply a 3-inch layer of mulch over the root zone, away from the trunk.
Pro Tip
Prune young trees to develop a single, strong central leader and well-spaced scaffold branches to ensure a durable, long-lived structure.
Keep It Thriving
Care Guide
Do
- Provide ample space for its large mature size.
- Water deeply during periods of drought.
- Prune during dormancy to maintain a strong structure.
- Monitor for signs of pests or disease, even with its high tolerance.
- Mulch to protect the root system and conserve water.
Don't
- Don't plant it under power lines or too close to buildings.
- Avoid soil compaction over the root zone.
- Don't prune during the growing season (April-August) to avoid attracting elm bark beetles.
- Don't 'top' the tree, as this destroys its natural form.
- Don't overwater or plant in boggy, anaerobic soil.
Seasonal Care Calendar
| Task | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Fertilize | ||||||||||||
| Pest Check | ||||||||||||
| Prune |
Watch Out For
Pests & Diseases
Common Pests
Common Diseases
In the Garden
Landscape Uses & Companions
Landscape Uses
Companion Plants
Multiply
Propagation Methods
Good to Know
Common Questions
New Harmony American Elm questions
What zones can New Harmony American Elm grow in?
New Harmony American Elm is hardy in USDA Zones 4–9. Inside that range it survives winter in the ground; outside it, grow it as an annual or a container plant you protect.
Is New Harmony American Elm deer resistant?
Not reliably. Deer may browse New Harmony American Elm, especially tender spring growth — plan on repellents or fencing where pressure is high.
When does New Harmony American Elm bloom?
New Harmony American Elm typically blooms in early spring through early spring. Exact timing shifts a week or two with your zone — Sow's bloom calendar maps it to your garden.
Does New Harmony American Elm need full sun?
New Harmony American Elm does best in full sun (6+ hours).
Is New Harmony American Elm drought tolerant?
Yes — once established (usually after the first full season), New Harmony American Elm handles dry spells with minimal watering. Water deeply its first year to build the root system that makes that possible.
More Ulmus to compare
Princeton Elm
Ulmus americana 'Princeton'
Variegated Chinese Elm
Ulmus parvifolia 'Variegata'
Colonial Spirit American Elm
Ulmus americana 'Colonial Spirit'
Allee Lacebark Elm
Ulmus parvifolia 'Emer Ii'
Everclear Lacebark Elm
Ulmus parvifolia 'Everclear'
Prairie Expedition American Elm
Ulmus americana 'Lewis & Clark'
Keep exploring
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Grow New Harmony American Elm with confidence
See it in a design of your actual yard, get zone-matched care reminders, and track it season by season in your garden journal.
