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How to Grow Compacta

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Compacta

Ilex crenata 'Compacta'

shrub

Compacta is a compact cultivar of Japanese holly, characterized by its dense, rounded growth habit and small, dark green glossy leaves. This evergreen shrub is popular for ornamental landscaping, topiary, and formal hedging due to its refined appearance and manageable size.

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

  1. Plant Compacta

    Around Apr 17

    Near Pittsburgh's average last spring frost.

  2. Tend & protect

    Late spring–summer

    Watering, feeding, and pest-watch reminders.

  3. Harvest Compacta

    Late summer into fall

    Before the first fall frost (≈ Nov 8)

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

Growing Conditions

☀️
Sun: Partial shade to full sun; 4-6 hours of sunlight daily preferred, with afternoon shade in hot climates
💧
Water: Consistently moist but not waterlogged; water deeply 1-2 times weekly during growing season, reduce in winter. Prefers even moisture levels year-round
📏
Spacing: 24-36 inches
📅
Days to maturity: 2-3 years to establish mature form
🌱
Planting depth: Plant at same depth as root ball; do not bury stem

Soil

Type: Well-draining loamy soil with organic matter
pH: 5.5-6.5
Amendments:
Peat moss or compost Perlite for drainage Pine bark mulch

Growing Zones

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

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

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Growth Stages

1

Establishment

6-12 months

Young plant with developing root system and initial branching structure

Keep soil consistently moist, avoid transplant shock by providing afternoon shade during first year, mulch around base without touching stem

2

Vegetative Growth

12-24 months

Dense, compact branching with small dark green leaves filling in the form

Water regularly, apply balanced fertilizer in spring, begin light pruning to shape if desired

3

Mature Shrub

Ongoing

Full, dense rounded form with established branching and glossy foliage

Maintain consistent moisture and mulch, prune after flowering or in early spring to maintain shape, fertilize annually

4

Flowering

3-4 weeks in spring

Small, inconspicuous white or pale pink flowers appear in leaf axils

Minimal intervention needed; female plants may develop small red berries if pollinated

5

Fruiting (Female Plants)

Fall through winter

Small bright red berries develop on female plants if male pollinator nearby

Berries provide winter interest and food for wildlife; no special care required

Companion Planting

Plan your garden →

Plant with:

Boxwood Euonymus Rhododendron Azalea Hosta Fern Skimmia

Avoid planting near:

Plants requiring dry conditions Salt-tolerant species in non-saline soil Aggressive root competitors

Common Pests

  • Prune infested leaves, apply spinosad or neem oil in spring, encourage natural predators

  • Spray with horticultural oil in dormant season, apply insecticidal soap during growing season, prune heavily infested branches

  • Increase humidity, spray with water to dislodge, apply neem oil or miticide if severe

  • Hand-pick in early morning, use pheromone traps, apply neem oil or insecticidal soap

Uses

🏠

Formal Hedging & Topiary

Household

Compacta's dense, compact growth and fine foliage make it ideal for creating formal hedges, parterre gardens, and intricate topiary shapes. It responds well to regular pruning and can be trained into geometric forms. [source]

🌿

Foundation Planting

Ornamental

The evergreen foliage and rounded form make Compacta excellent for foundation plantings around homes, providing year-round structure and visual interest with minimal maintenance. [source]

🦋

Wildlife Habitat

Wildlife

Female plants produce red berries that provide food for birds and wildlife throughout fall and winter, while the dense foliage offers shelter and nesting sites. [source]

🌿

Container Growing

Ornamental

Compacta's compact size and slow growth make it well-suited for container cultivation on patios, decks, and entryways, where it can be formally displayed or used for seasonal arrangements. [source]

🏠

Cut Foliage for Arrangements

Household

The glossy evergreen branches with small leaves are prized by florists and gardeners for use in winter holiday arrangements, wreaths, and fresh cut arrangements. [source]

Harvest Tips

Not applicable for ornamental use; prune branches for arrangements or topiary shaping in late winter or early spring. Harvest berries in fall by cutting branches with female berries for indoor arrangements

Fun Facts

  • 🌱 Compacta is a cultivar of Ilex crenata, native to Japan, China, and Korea, and was specifically selected for its exceptionally dense, compact growth habit compared to the species
  • 🌱 Unlike many holly species with large leaves, Japanese holly has the smallest leaves of all holly plants, giving Compacta its refined, delicate appearance suitable for fine-scale topiary work
  • 🌱 Compacta is slow-growing but long-lived, often remaining attractive for 50+ years with proper care, making it a worthwhile investment for formal garden designs

Gardening Terms

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

Annual Cultivar Full Sun Mulch Partial Shade Transplant
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