Help!! Japanese Knotweed - Any tips?

Don't lay a patio until you've killed the stuff it will grouw through the gaps and ruin it in no time, a school local to us laid new tennis courts over some and it grew up through the tennis courts the next year. It is scary stuff your only real option is regular use of roundup, is the outbreak confined to your property? If neighbouring properties have it you neeed to work with them otherwise it will spread back.
 
We deal with it all the time in construction, the best way to get rid of it is to spray it in the right part of the season so that it get taken into the roots, cutting and digging out doesn't really work very well.

We usually pay £400 for a days spraying and you will need two sprays half a year apart.

It is illegal to move it or knowingly grow it be careful
 
a1ex2001 said:
Don't lay a patio until you've killed the stuff it will grouw through the gaps and ruin it in no time, a school local to us laid new tennis courts over some and it grew up through the tennis courts the next year. It is scary stuff your only real option is regular use of roundup, is the outbreak confined to your property? If neighbouring properties have it you neeed to work with them otherwise it will spread back.
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it seems to sit in our privot hedge boundry with the neighbor, its growing up through the privot for a length of 20 metres.

will round up kill the privot?

but as suggested i need to work with the girl next door, to get rid of this.

this in itself is going to be tricky, i accidently opened a parcel of hers a month or so ago, that was delivered to my house. i just assumed it was the missus (allways grabbin stuff of the bay)

i opened it and it was three sex toys and some lube, i handed them into her explaining my mistake, and she hasnt spoke to me since :rolleyes:
 
From what I remember from my construction days japanese Knotweed is classed as an invasive species of plant, brought into the UK many moons ago as a decorative plant.

It spreads through the use of 'ribozomes' (shoots underground) which can spread upto 20m from the main stem. These then shoot out of the ground during a growing season. Able to punch through concrete.. nasty stuff.

Treatments we used to think about were seasonal spraying with herbicides (2 times a year for a few years) or by digging it out, along with a hell of a lot more ground from around the area and capping it with concrete.

Rhizomes if I remember can be resistant to fire and need to be incinerated. Burning and throwing away wont always work. Disposal of the stems / rhizomes have big legal implications (Double bagged) hazardous waste and not many places take it as they have to be setup appropiately to accept it..

Best local treatment is to burn the stuff and bury it deep (5m) under a root membrane. Not many people can dig a whole 5m deep in their back garden. Best get in the specialists 8o))

If you have just seen it get it treated now, dont let it spread.. If you knowingly allow it to spread to other areas such as neighbours they may try and stitch you up for there treatment costs.

This stuff is a bane.... But seriously dont let it spread or it will bankrupt you to fix the mess it makes.. 8o(
 
norris1337 said:
Bio-Control.

Old article - http://news.bbc.co.uk/1/hi/7531221.stm

Interesting but I don't think it went anywhere.
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The last I heard was that it has been trialled in an area, however I'm not sure which area!

@UncleRuckus - You can actually make a vodka from it too... ;)

@Qtipp - I wouldn't recommend burying it under a membrane as it is extremely destructive and can actually break through concrete. Japanese Knotweed is a controlled plant and needs to be dealt with properly. It should be sprayed by a professional and disposed off by the professional. Even the smallest part which is cut off can grow into a whole new route system so it is very hard to get rid off!

I was at a site yesterday and snapped this photo of it breaking through a tarpaulin sheet:
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Bore holes at regular intervals, pour diesel in, ignite it.

Only downside, don't ever expect anything to grow again, except maybe grass
 
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