Killing Japanese knotweed
Moved house last year & discovered JKW at the end of the garden 100ft from house, I had it sprayed in May & Sept with asteroid biocare glyposate concentraite diluted at 50:1 ratio by a landscape gardener I know, he said this would eventually kill it. So far so good there is no new growth this year but what really confuses & frustrates me is assuming it eventually does die, what do I do then ?. I've an area approx 4-5 sq meters fenced off from the rest of the garden as if it was chernobyl & I can't find out what to do, I've contacted companies who all want me to employ them at approx 3k for spraying it with exactly the same stuff, i asked if they would eventually dig it up & they said no, well how does this help ? As far as i'm concerned the thing would still be in the ground, will it, crown roots & all eventually rot as last years dead is still protruding above the ground or should a certain section of the crown be removed ?