Japanese Holly
Ilex crenata
- Native to:
- China, Hainan, India, Japan, Korea, Kuril Is., Myanmar, Nepal, Russia, Taiwan, Vietnam
KENPEI
Taxonomy
- Division:
- Magnoliophyta | - Flowering plants
- Family:
- Aquifoliaceae
- Genus:
- Ilex
- Species:
- Ilex crenata
- USDA Symbol:
- ILCR2
Growth Characteristics
- Life Cycle:
- Perennial
- Growth Habit:
- Shrub , Tree
- Height:
- 300 cm
- Light Requirements:
- Full Sun
- Drought Tolerance:
- Medium
- Bloom Months:
- may,jun
- Bloom Colors:
- white
- Landscaping Shrub:
- Yes
Wildlife Benefits
- Caterpillars:
- ★☆☆☆☆ Recorded caterpillar host plant (HOSTS Database)
Keystone Species Ranking
- Caterpillar Keystone:
- ★★★★☆ Butterfly & moth species supported by this genus (NWF)
- Pollen Specialist Bee Keystone:
- ★☆☆☆☆ Native pollen specialist bee species supported by this genus (NWF)
Host Plant for Caterpillars
Abbot's Bagworm Moth (Oiketicus abbotii)
Garden & Ecology Notes
- Wildlife Value:
- birds
- Deer Resistant:
- Yes
Soil Requirements
- Soil Type:
- rich, well-drained loamy soil
- pH:
- 4.5 - 6.5 (acidic to slightly acidic)
- Drainage:
- excellent drainage required
- Moisture:
- consistently moist
- Notes:
- prefers organic matter-rich soils
Propagation & Germination
- Stratification:
- Warm then cold/moist stratification (double dormancy) — 60–90 days
- Germination Time:
- 30–180 days
- Notes:
- Seeds exhibit double dormancy requiring warm followed by cold stratification. Germination can be erratic and take up to two years.
ORGHPS Germination Guide: Expose to fluctuating outdoor winter temps incl. freezing for 3 months. Increase light/temp in spring.