Udo

Aralia cordata

Native to:
China, Japan, Korea, Kuril Is., Nansei-shoto, Russia, Taiwan

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Taxonomy

Division:
Magnoliophyta | - Flowering plants
Family:
Araliaceae
Genus:
Aralia
Species:
Aralia cordata
USDA Symbol:
ARCO33

Growth Characteristics

Height:
200 cm
Light Requirements:
Part Shade
Drought Tolerance:
Medium
Bloom Months:
jul,aug
Bloom Colors:
white, greenish-white

Keystone Species Ranking

Caterpillar Keystone:
★★☆☆☆ Butterfly & moth species supported by this genus (NWF)

Garden & Ecology Notes

Wildlife Value:
birds, small mammals
Fall Color:
yellow

Soil Requirements

Soil Type:
rich, well-drained loamy soil
pH:
5.5 - 7.0 (slightly acidic to neutral)
Drainage:
good drainage required
Moisture:
consistently moist
Notes:
prefers organic matter-rich environments

Propagation & Germination

Stratification:
Cold/moist stratification required — 60–90 days
Germination Time:
14–60 days
Notes:
Seeds benefit from cold stratification. Germination can be erratic; some seeds may require two seasons.

The above propagation data sourced from Claude AI

ORGHPS Germination Guide: Expose to fluctuating outdoor winter temps incl. freezing for 3 months. Increase light/temp in spring.

Source: Ontario Rock Garden & Hardy Plant Society