China knotweed (Persicaria chinensis)

China knotweed

Also known as: Red Bush, Buchwheat , Flowery Knotweed, Chinese knotweed, Southern smartweed, Common marsh buckwheat

China knotweed (Persicaria chinensis) is a flowering plant species that grows throughout China, Japan, the Indian Subcontinent, Indonesia, Malaysia, and Vietnam. China knotweed is also known as creeping smartweed. This species is considered a weed in some coastal regions of Australia.

Scientific classification

Species

China knotweed (Persicaria chinensis)

Pinks, cacti, and allies

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Perennial

Lifespan

Herb

Plant Type

Late spring, Summer, Fall, Early winter

Bloom Time

2 m to 3 m

Plant Height

White

Flower Color

Semi-evergreen

Leaf type

10 - 41 ℃

Ideal Temperature

Images of China knotweed

Distribution of China knotweed

Distribution Map

China knotweed is originally native to various regions in Asia and some parts of Southeast Asia, thriving in a range of climates across these major areas. It has also been introduced to other regions where it is cultivated for various purposes. In some areas beyond its native range, china knotweed is sometimes thought to be invasive and may have an impact on local ecosystems. Despite its presence in different continents, china knotweed maintains a moderate cultivation profile and is not universally disruptive to the habitats it occupies.

Native

Cultivated

Invasive

Introduced

No species reported

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Habitat

Man-made or disturbed habitats, meadows, fields

Hemisphere Trend Curve

Northern

Sorthern

Culture

Symbolism

Binding, Health

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Care Guide for China knotweed

Every week

Water

Full sun

Sunlight

10 - 41 ℃

Ideal Temperature

Water: China knotweed thrives in moist environments, requiring regular irrigation without waterlogging. Water weekly to maintain health, it adapts well outdoors, benefiting from natural rainfall. Optimal soil moisture levels should mimic its native habitat for best growth and vigor.

Fertilize: For optimal growth, china knotweed requires balanced fertilizer applied quarterly at half-strength. Increase feeding in spring and summer, and reduce in fall and winter. Water china knotweed after fertilization to enhance nutrient uptake and prevent root burn, starting with smaller quantities for better observation.

Pruning: China knotweed features a sprawling growth and lance-shaped leaves. Pruning in early to late spring promotes dense growth, removes dead wood, and boosts vigor. Annual pruning is advised for manageability and healthier foliage.

Propagation: China knotweed is a vigorous, spreading perennial that roots readily from healthy, non-flowering cuttings. Ensure each cutting has at least one node and plant in moist, well-draining soil. Provide consistent moisture for successful establishment and thriving growth in your ornamental garden.

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Images of China knotweed

Distribution of China knotweed

Culture

Care Guide for China knotweed

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