Mainly dealing with Japanese Knotweed & Himalayan Balsam which are really starting to become established along the Dodder. While not presenting any direct danger to the public, Japanese Knotweed (which spreads by tiny pieces of root and sections of stem) grows to such a density that it prevents any other plants from growing. In winter when it dies down it leaves river banks exposed which can cause
Siltation this is bad for fish and other organisms that live in our waterways. It can even push up through tarmac and concrete, damaging pavements and dislodging slabs. In the UK banks now can refuse a morgage for a property that has J. Knotweed on or adjacent to it. Soil contaminated with any part of the plant should not be moved as this will encourage further spread. There are strict guidelines set out by several Government bodies that have to be followed for anyone seeking to control Japanese Knotweed. It is recommended that in the UK alone the cost of controlling this plant is 150 million euro. For Europe as a whole it is quoted at several billion. Complete name: Fallopia japonica (Houtt.) Ronse Decraene
Description
Herbaceous perennial with robust erect stem up to 4 m tall and extensive system of rhizomes, 15-20 m long, penetrating 2-3 m deep in soil. The invasive knotweeds in Ireland include Fallopia japonica var. japonica, F. sachalinensis, and their hybrid, F. x bohemica. Control: Needs a rigorous treatment regime. which follows a Control programme set out by Invasive/Species/Ireland. A management plan will be drawn up which will cover all aspects of control including a monitoring schedule of repeat treatment and observation for 3 - 5 years.
