SLENDER KNOTWEED FACTS
Map is from The Atlas of Living Australia web site, licensed under Creative Commons Attribution 3.0 Australia License
Slender Knotweed is a decumbent to ascending annual or perennial herb to 30 cm high. Leaves are narrow-elliptic to lanceolate (spear-shaped), from 5-12 cm long and 5-13 cm wide and often with a purple blotch near the middle of the upper surface.
Flower-heads are rather lax to drooping, elongated cylindrical spikes, 2-6 cm long and 3-4 mm diameter and flower parts 1.7-2.5 mm long. The fruit is a dark brown to black, lens-like or triangular nut, 1.5-2 mm long.
Semi-aquatic plants of freshwater environments. Grows in water and on wet flats at the edges of rivers, lagoons and lakes and in marshes, swamps and drainage lines. High waterlogging tolerance.
Australian native, all States. South Australia, Western Australia, Victoria., New South Wales, Queensland, Australian Capital Territory, Northern Territory, Tasmania.
Height (m): 0.2 - 0.5
Spread (m): 0.3 - 1
Soil Texture: sand, loam, clay
Soil pH: acid soils, neutral soils
Frost Sensitivity: moderately sensitive
Minimum Rainfall (mm): the species is best suited to constantly moist sites
Flower Colour: pink
Flower Season: winter, spring
(source: SA State Flora Catalog)
|Common Name:||Slender Knotweed|