Cultivated Knotweed

Koenigia polystachya

Native to:
Afghanistan, China, India, Nepal, Pakistan

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Taxonomy

Division:
Magnoliophyta | - Flowering plants
Family:
Polygonaceae
Genus:
Koenigia
Species:
Koenigia polystachya
USDA Symbol:
POPO5

Growth Characteristics

Life Cycle:
Perennial
Growth Habit:
Forb/herb
Height:
200 cm
Light Requirements:
Full Sun
Drought Tolerance:
Low
Bloom Months:
jul,aug,sep,oct
Bloom Colors:
white, pink

Garden & Ecology Notes

Wildlife Value:
bees, butterflies
Deer Resistant:
Yes

Soil Requirements

Soil Type:
moist, fertile, well-drained loamy soil
pH:
5.5 - 7.5 (slightly acidic to neutral)
Drainage:
good drainage required
Moisture:
consistently moist
Notes:
prefers high-altitude regions with ample rainfall

Propagation & Germination

Stratification:
Cold/moist stratification required — 30–60 days
Germination Time:
14–28 days
Notes:
Seeds germinate readily with cold stratification. Light may improve germination rates.

The above propagation data sourced from Claude AI