Allee lacebark elm

Sun

Full sun; tolerates light partial shade but develops its best crown in an open position.

Water

Water regularly while establishing; moderately drought-tolerant once established.

Soil

Adaptable to clay, loam and sandy soils, including moderately alkaline ground, provided drainage is reasonable. Avoid persistently waterlogged sites.

Height

60-70 ft (18-21 m)

Spread

35-55 ft (11-17 m)

Foliage

Small, glossy, dark green leaves with toothed edges; autumn colour ranges from yellow to bronze or reddish purple and is variable.

Growth

Fast when young, especially with adequate moisture.

Care needed

Medium

• Drought tolerant
• Heat tolerant
• Disease resistant
• Wildlife

Northern hemisphere months. In Australia, shift them by six.

Difficulty

Moderate

Toughness

Very tough

Pick your zone, country, light and whether you have pets.

1. Planting day

   8 ft (2.3 m)

2. After 1 year

   12 ft (3.7 m)

3. After 2 years

   16 ft (5 m)

4. After 3 years

   21 ft (6.3 m)

5. After 5 years

   29 ft (8.9 m)

About 13 years to full size.

From a typical nursery size, at an average rate for this kind of plant. A rule of thumb, not a forecast.

Cats and dogs

Safe

Invasive in

the US and Australia

In the garden

Spreads vigorously: plan to contain it.

Growth rate

Fast

• Plant with the root flare at ground level, well away from buildings, overhead wires and confined paving.
• Water deeply during dry spells for the first two or three growing seasons, moistening the root ball and surrounding soil.
• Spread 2-3 in (5-8 cm) of mulch over the root area, keeping it clear of the trunk.
• Stake only if the root ball moves in wind; use flexible ties and remove supports once the tree is anchored, usually within a year.
• Do not feed routinely; use a soil test if growth is poor or leaves are unusually pale.

Pruning. Prune young trees in late winter to establish a sound central framework and remove narrow forks or competing leaders gradually. Follow local elm-pruning restrictions where these apply, and use a qualified arborist for large branches.

Late winter

Inspect branch unions and carry out light structural pruning where local elm-pruning rules permit.

Spring

Plant container-grown trees when the soil is workable; check planting depth and water thoroughly.

Late spring

Renew mulch and inspect young leaves for chewing damage.

Summer

Water establishing trees deeply during dry weather and check that ties are not cutting into the bark.

Autumn

Remove unwanted seedlings while small and collect fallen leaves from paths.

Winter

Inspect the exposed trunk and branches for damage; leave naturally flaking bark in place.

• Plant as a specimen shade tree in a large lawn, where its vase-shaped crown can develop freely.
• Use in a broad avenue or spacious driveway approach for a repeated, arching canopy.
• Position where the mottled trunk is visible from a window or winter seating area.
• Underplant an established tree with shade-tolerant perennials, keeping cultivation shallow to protect roots.

Garden styles it suits: Grand estate, Traditional, Urban city garden, Winter interest, Family-friendly and Chinese scholar garden.

Plant it with: Liriope, Barrenwort, Hellebores, Autumn fern, Daffodils and Japanese sedge.

Wildlife: The crown provides shelter and nesting sites for birds, and the leaves support some insect feeding. Its small, wind-pollinated flowers offer little nectar value for pollinators.

• Elm leaf beetles can skeletonise leaves. Check for larvae beneath leaves; seek locally appropriate treatment for repeated heavy defoliation rather than spraying a large tree indiscriminately.
• Scale insects may cause sticky honeydew and sooty mould. Confirm the pest before treatment, protect beneficial insects and obtain professional advice for a large canopy.
• Tight forks and competing stems can produce weak branch unions. Correct these gradually while the tree is young rather than making large cuts later.
• Dutch elm disease resistance is high, but not absolute. Have sudden branch wilting or dieback assessed promptly and follow local sanitation and pruning rules.

Not known to be toxic to people, cats, dogs or horses. No part is recognised as a significant poisoning hazard, though the leaves, bark and seeds are not recommended as food.

Where it spreads. The species can self-seed freely and has escaped cultivation in parts of the southeastern United States and eastern Australia, including New South Wales. It can be locally weedy or invasive; check regional guidance before planting. Do not assume 'Emer II' is seedless.

• Siberian elm (Ulmus pumila)

  Usually has rough, furrowed bark rather than the mature lacebark elm's mottled, flaking bark; its winged seeds ripen in spring rather than autumn.

• Japanese zelkova (Zelkova serrata)

  Can have a similar vase-shaped crown and peeling bark, but its leaves usually have larger, more pronounced teeth and its fruits are small nutlike structures rather than flat, winged elm seeds.

• Drake Chinese elm (Ulmus parvifolia 'Drake')

  Shares the small leaves and mottled bark, but generally develops a broader, more rounded crown than Allee. Confirm young trees from a reliable cultivar label, since shape alone is not conclusive.

Ulmus is the Latin name for elm, parvifolia means small-leaved, and lacebark refers to the patterned bark exposed as the outer layers flake away.

Propagation. Named plants must be propagated vegetatively, usually by nursery grafting, budding or cuttings. Seedlings will not reliably retain the Allee cultivar's shape and other characteristics.

Accepted botanical name

Ulmus parvifolia

In the US and Canada

Introduced in Canada and the lower 48 states.

Native range

China North-Central, China South-Central, China Southeast, Japan, Korea, Nansei-shoto, Taiwan and Vietnam.

Measured

Soil pH 4.8 to 7. Average height 1200 cm.

Sources: GBIF (CC BY 4.0), USDA PLANTS and Trefle (CC BY 4.0). The care and design notes are LandscapeGPT's own.