On Sat, 31 May 2014 23:12:31 +0100, Janet wrote:

In article ,
says...

My garden has a patch of knotweed. It looks quite nice and never
spreads beyond the fence.

Description doesn't sound like knotweed :-)

Janet

It looks just like knotweed especially the rigid hollow stems and
bunches of white flowers that come later in the year.

Steve

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