Reynoutria, Asian Knotweed, Japanese Knotweed 'Compacta'

Reynoutriajaponica

Species
japonica (juh-PON-ih-kuh)
Synonym
Fallopia japonica
Sun Exposure
Full Sun
Foliage
Herbaceous
Smooth
Height
36-48 in. (90-120 cm)
Spacing
24-36 in. (60-90 cm)
Hardiness
USDA Zone 4a: to -34.4 °C (-30 °F)
USDA Zone 4b: to -31.6 °C (-25 °F)
USDA Zone 5a: to -28.8 °C (-20 °F)
USDA Zone 5b: to -26.1 °C (-15 °F)
USDA Zone 6a: to -23.3 °C (-10 °F)
USDA Zone 6b: to -20.5 °C (-5 °F)
USDA Zone 7a: to -17.7 °C (0 °F)
USDA Zone 7b: to -14.9 °C (5 °F)
USDA Zone 8a: to -12.2 °C (10 °F)
USDA Zone 8b: to -9.4 °C (15 °F)
Danger
N/A
Bloom Color
White/Near White
Bloom Time
Late Summer/Early Fall
Other Details
Category
Perennials
Water Requirements
Average Water Needs; Water regularly; do not overwater
Foliage Color
Where to Grow
Bloom Characteristics
Bloom Size
Other details
May be a noxious weed or invasive
Soil pH requirements
6.1 to 6.5 (mildly acidic)
Patent Information
Non-patented
Propagation Methods
By dividing rhizomes, tubers, corms or bulbs (including offsets)
Seed Collecting
Collect seedhead/pod when flowers fade; allow to dry
Regional

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Gardener's Notes:

1
positive
0
neutral
0
negative
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G
Everson, WA (Zone 7b) | May 2009 | positive

For those of you that don't like invasive plants, but want to grow one just for the experience, I would recommend this plant. It only ge...Read More

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