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How to Grow Windmill

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Windmill

Ulmus parvifolia 'Lace'

tree

Windmill is a compact ornamental elm cultivar prized for its delicate, lacy foliage and graceful branching habit. It grows as a small deciduous to semi-evergreen tree with fine-textured leaves and an elegant, spreading form. This cultivar is valued as a landscape specimen and is also popular as a bonsai subject.

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Example Windmill timeline · Pittsburgh, PA (Zone 6b)

  1. Plant Windmill

    Around Apr 17

    Near Pittsburgh's average last spring frost.

  2. Tend & protect

    Late spring–summer

    Watering, feeding, and pest-watch reminders.

  3. Harvest Windmill

    Late summer into fall

    Before the first fall frost (≈ Nov 8)

Sample dates for Pittsburgh, PA. Sign up to get exact Windmill dates for your own zip code.

Growing Conditions

☀️
Sun: Full sun to partial shade, 6+ hours of direct sunlight daily
💧
Water: Moderate watering; keep soil consistently moist but not waterlogged. Establish deep watering during the first 2-3 years. Drought-tolerant once established but performs better with regular moisture.
📏
Spacing: 240 inches
📅
Days to maturity:
🌱
Planting depth: Plant at same depth as root ball; do not plant deeper

Soil

Type: Well-draining loamy soil
pH: 6.0-7.5
Amendments:
Compost Peat moss Bark mulch for moisture retention

Growing Zones

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Zones 5-9, with best performance in zones 6-8

5a 5b 6a 6b 7a 7b 8a 8b 9a 9b

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Growth Stages

1

Establishment

First 2-3 years

Young sapling with developing root system and initial branching structure

Water deeply and regularly. Stake if necessary for support. Prune only to remove damaged branches. Mulch around base to retain moisture.

2

Juvenile Growth

Years 3-5

Tree develops its characteristic branching pattern with increasingly fine, lacy foliage

Light pruning to shape form. Remove any crossing or weakly growing branches. Continue consistent watering. Apply balanced fertilizer in spring.

3

Maturation

Years 5-10

Tree reaches mature size and shape with full, delicate canopy and graceful spreading form

Prune in late winter before new growth. Remove dead or diseased wood. Thin interior branches for airflow. Fertilize annually in early spring.

4

Full Establishment

Year 10 onward

Established mature tree with refined form, dense fine-textured foliage, and strong branch structure

Minimal pruning needed except maintenance. Water during drought. Monitor for pests and diseases. Selective pruning to maintain shape and light penetration.

Companion Planting

Plan your garden →

Plant with:

Hydrangeas Hostas Japanese maples Understory shrubs like boxwood Groundcovers like ivy or vinca

Avoid planting near:

Black walnut (allelopathic) Competitive shallow-rooted trees Plants requiring dense shade

Common Pests

  • Spray neem oil or insecticide in spring; maintain tree vigor; remove and destroy affected leaves

  • Increase humidity; spray with water or insecticidal soap; use miticide if severe

  • Spray with water; use neem oil or insecticidal soap; encourage beneficial insects

  • Prune out heavily infested branches; apply horticultural oil during dormant season

  • No cure; prevention is key—maintain tree vigor; control leafhopper vectors with insecticides if necessary

Uses

🏠

Ornamental Landscape Tree

Household

Windmill elm serves as an excellent specimen tree in gardens and landscapes, providing year-round visual interest with its fine-textured, lacy foliage and graceful branching pattern. Its compact size makes it suitable for medium-sized properties. [source]

🎨

Bonsai Subject

Craft

The delicate, fine foliage and responsive growth habit make Windmill elm a highly prized bonsai specimen. It develops intricate branch structure and aged appearance relatively quickly with proper training. [source]

🦋

Wildlife Support

Wildlife

The tree provides shelter and food sources for birds, insects, and small mammals. Its dense canopy creates excellent nesting and perching sites, while seeds and foliage support various wildlife species. [source]

🏠

Shade and Privacy

Household

When mature, Windmill elm provides dappled shade suitable for creating outdoor living spaces or screening views. The filtered light allows understory plants to thrive beneath it. [source]

Harvest Tips

Not applicable for ornamental tree; however, if growing as bonsai, prune branches back to desired shape during growing season, pinching new growth to maintain form

Fun Facts

  • 🌱 Windmill elm is a cultivar of Chinese elm (Ulmus parvifolia), which is prized in Asian art for centuries as a bonsai specimen and has been grown in bonsai collections for over 1,500 years.
  • 🌱 Unlike American elm species susceptible to Dutch elm disease, Chinese elm and its cultivars like Windmill show much greater resistance to this devastating fungal disease, making them valuable replacements in landscapes.
  • 🌱 The 'Windmill' cultivar name may reference the distinctive pattern of fine, delicate branches radiating from the trunk, resembling the blades of a windmill.

Gardening Terms

New to gardening? Learn about terms used in this guide:

Annual Cultivar Full Sun Mulch Partial Shade
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