Mat Forming Knotweed

Campanulata lesser knotweed compact form with green mat forming foliage covered by clusters of fragrant pale pink flowers.

Mat forming knotweed.

Its leaves are smooth alternate and somewhat blue green in color. Vigorous persicaria affinis superba lesser knotweed is a mat forming semi evergreen perennial boasting charming spikes 3 in. Biology knotweed is a perennial plant that spreads primarily vegetatively to form dense thickets that suppress native vegetation. Its presence is usually considered a sign for.

Persicaria affinis darjeeling red knotweed darjeeling red. Due to its ability to rapidly spread this invasive weed can easily overwhelm other plant. Dead wire like stems persist through winter. Height 3ft 1m spread 3ft 1m.

Spikes of pink poker like flowers which darken with age. Long 8 cm densely packed with tiny flowers over a long season. A stem of prostrate knotweed exhibiting longitudinal ridges and the presence of flower buds in a leaf axil. The threat of japanese knotweed.

Prostrate knotweed prostrate knotweed is a warm season annual broadleaf weed that has prostrate mat forming branched stems. Associated with compacted sites. Persicaria affinis lesser knotweed is a mat forming semi evergreen perennial boasting charming spikes 3 in. Native to the himalayas.

Knotweed polygonum arenastrum buckwheat family polygonaceae description this eurasian import a prostrate mat forming annual often with erect terminal stems thrives in our most inhospitable sites c d. Japanese knotweed spreads rapidly and can grow as tall as 2 1 m 7ft. The species can be confused with spotted spurge euphorbia maculata which is also a mat forming weed that can occupy some of the same habitats agricultural areas landscapes other disturbed sites as prostrate knotweed. Stems are swollen and have papery sometimes reddish sheaths at the nodes which mark the junction of the leaf and stem e.

Thin taproot fibrous stems. Semi evergreen mat forming perennial with green narrow leaves that turn bronze over winter. These linear oblong leaves join to the stems by a sheathing membrane and its dull brown seeds stay viable for many years. Veolia were starting work on a water treatment works project where the route to the site had an abundant overgrowth of one of the world s worst invasive non native plant species japanese knotweed.

Resembles grass seedlings when it germinates in march. Fingernail like ocrea surround base of the leaves. Long 8 cm densely packed with tiny pale pink flowers that deepen to crimson as they mature. Alternate leaf arrangement lanceolate dull blue green leaves.