Knotweed Ireland

Plant Description

Knotweed is a giant perennial which grows at an alarming rate of up to 10cm per day in any type of soil.

It forms dense clumps of up to 3m (10ft) in height. Japanese Knotweed thrives on disturbance and spreads by natural means and by human activity. Very small fragments of rhizome (underground stems), as little as 0.7g - approximately the size of a fingernail - can produce fresh new plants.

Below ground is where this invader causes the biggest problems, as each stand creates a rhizome network that can extend to 3m in depth and 7m in all directions.