American holly - Ilex opaca

🌿American holly - Ilex opaca 

🔸 Full name

• Common name: American holly, American holly
• Botanical name: Ilex opaca
• Family: Aquifoliaceae
• Type: Evergreen shrub or small tree

🌳 General description

• Origin: Eastern and southeastern United States
• Habit: Conical to pyramidal, dense and elegant
• Mature height: 6 to 12 m (sometimes more in its native range)
• Width: 3 to 6 m
• Growth: Slow to moderate
• Special features: Evergreen, matte foliage (less shiny than European holly, Ilex aquifolium), very hardy and ornamental in winter.

🌱 Foliage

• Type: Evergreen
• Leaves: Oval to elliptical, thick, matte green, with slightly serrated and prickly edges
• Length: 5 to 8 cm
• Note: Foliage softer to the touch and less shiny than that of common holly (Ilex aquifolium).

🌸 Flowering

• Period: May to June
• Flowers: Small, whitish to cream-colored, inconspicuous but melliferous
• Arrangement: Axillary (at the base of the leaves)

🍒 Fruit (berries)

• Shape: Small spherical drupes 6–10 mm in diameter
• Color: Bright red when ripe (rarely orange)
• Fruiting period: Fall to winter
• Duration: Often persist throughout the winter
• Special feature: Toxic to humans but very popular with birds

🌾 Pollination

• Type: Dioecious → a male and female plant are needed to produce fruit.
• Recommended distance: 5–10 m maximum between the two.
• Good pollinators: Other male Ilex opaca or sometimes compatible Ilex aquifolium.
• Note: A single male plant is sufficient for several female plants.

🌿 Cultivation and care

• Exposure: Light sun to partial shade
• Soil: Deep, cool, well-drained, slightly acidic to neutral (avoid calcareous soils)
• Watering: Regularly for the first few years, then tolerates drought well
• Pruning:
  • Light, preferably after flowering (June)
  • Can be pruned for hedges, topiaries, or conical shapes
• Fertilization: Add compost or leaf mold in spring

🧊 Hardiness

• USDA hardiness zone: 5 to 9
• Minimum temperature: Down to -25°C
  👉 Very hardy, suitable for all regions of mainland France (except extreme mountain areas).

🌿 Resistance and health

• Disease resistance: Excellent
• Possible sensitivities: Slight attacks by scale insects or aphids, rarely a cause for concern
• Pollution tolerance: Good
• Drought tolerance: Average once well established

💡 Advantages

✅ Decorative evergreen foliage
✅ Highly ornamental red berries in winter
✅ Hardy and resistant shrub
✅ Suitable for hedges, flower beds, or as a specimen plant
✅ Excellent refuge for wildlife (birds, pollinators)

⚠️ Points to consider

⚠️ Slow growth—allow time for a large specimen to develop
⚠️ Dioecious—plant at least one male for fruiting
⚠️ Fruit is toxic to humans (avoid ingestion)

🌳 Interesting varieties

Ilex opaca ‘Greenleaf’ → Dark green foliage, compact habit

Ilex opaca ‘Xanthocarpa’ → Orange-yellow fruit

Ilex opaca ‘Canary’ → Light green foliage and abundant fruiting

Ilex opaca ‘Satyr Hill’ → Female variety, very decorative, bright red berries, dense foliage