Narrowpoint Knotweed

Polygonum ramosissimum subsp. ramosissimum

Native to:
Canada, Mexico, Prince Edward I., United States

Taxonomy

Division:
Magnoliophyta | - Flowering plants
Family:
Polygonaceae
Genus:
Polygonum
Species:
Polygonum ramosissimum subsp. ramosissimum
USDA Symbol:
POLE6

Growth Characteristics

Life Cycle:
Annual
Growth Habit:
Forb/herb
Height:
120 cm
Light Requirements:
Full Sun
Drought Tolerance:
High
Bloom Months:
jun,jul,aug,sep,oct
Bloom Colors:
green, white

Garden & Ecology Notes

Wildlife Value:
birds
Salt Tolerant:
Yes

Soil Requirements

Soil Type:
sandy, well-drained, nutrient-poor soil
pH:
5.5 - 7.5 (slightly acidic to neutral)
Drainage:
excellent drainage required
Moisture:
dry to moderate
Notes:
Common in disturbed areas and sandy soils

Propagation & Germination

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

The above propagation data sourced from Claude AI