Japanese Knotweed Removal


What is Japanese Knotweed?


Red buds begin to emerge from the base of the plant (the crown) during February-March and develop in to small fleshy deep red/purple asparagus type shoots and start to grow rapidly. Maturing canes are hollow, somewhat like bamboo and are identified with red speckled characteristics with curled red veined leaves. These leaves start to turn dark green and unfold towards end of Spring.


The combination of sheer height and density of Japanese knotweed in the summer makes the plant easily identifiable. At an average of between 2-3 metres high in full bloom, the spade shaped leaves and spiky stems with creamy white flowers make the plant appear attractive. However, the exponential growth above ground masks the speedy way in which the underground rhizomes are expanding.

Knotweed is a good source of nectar and may attract bees and other pollinating insects and full bloom begins around late August.


The appearance of Japanese knotweed in autumn will have very similar traits as in late August, as the flowers will be in full bloom until October. Towards the end of October and through to November, the leaves will start to wilt and turn yellow and the stems will become dark brown in colour and start to become dormant.


The leaves have fallen and the dark brown canes will appear to be decomposing and may collapse and intertwine.  New seasons shoots may already begin to appear under the dense brittle canes. Whilst in winter, knotweed remains dormant above ground, below ground the rhizomes are still present and may continue to grow.