Japanese Knotweed - Indestructable?

El Sid · May 25, 2014

Any green fingered types on here who can advise on getting rid of Japanese Knotweed?

I've dug it out several times, poured killer potions over it, burned it and put a curse on it.
Still it thrives!

Help!

Notters · May 25, 2014

You have to let it grow vigorously before you poison it otherwise there aren't enough leaves to absorb the poison.

If you want free advice, or indeed treatment, you could contact Brighton - based company Phlorum.

glasfryn · May 25, 2014

Notters said:
You have to let it grow vigorously before you poison it otherwise there aren't enough leaves to absorb the poison.

If you want free advice, or indeed treatment, you could contact Brighton - based company Phlorum.

spot on
the guy over the road from me used diesel fuel on it at its biggest and it went away for a few years then came back

Notters · May 25, 2014

glasfryn said:
spot on
the guy over the road from me used diesel fuel on it at its biggest and it went away for a few years then came back

You also usually have to treat it several years in a row. Don't know about diesel though, that would contaminate your soil. Best to use Roundup.

Cheshire Cat · May 25, 2014

http://www.devon.gov.uk/index/envir...ity/japanese_knotweed/control_of_knotweed.htm

Several years hard labour apparently, and even then may not be succesful.

Small thermo-nuclear device might work?

KZNSeagull · May 25, 2014

RHS reckon it will take 4 years to get rid of it using Glyphosate (which will kill other plants too). They suggest spraying in May, again in July and again in September.

http://www.rhs.org.uk/advice/profile?PID=218

I am having a major problem with Bamboo invading from next door. Have resorted to digging it up where I can and used some stuff called Chopper, which is usually used on tree stumps!

jevs · May 25, 2014

There was something on countryfile about this. Apparently, you cut it off about 18" above ground and then pour in a very strong roundup mix into the hollow stems on a regular basis.

The other thing they showed you is that you can actually eat it. They took some young stems, removed the leaves, cut into 1" lengths and then stewed it in a sugar syrup....just like rhubarb. Apparently tasted like rhubarb too.

Brighton TID · May 25, 2014

This is seriously bad shit. You have to remove all of the root system otherwise it will come back. The stems are hollow and you need to inject poison straight in. Don't spread any part of the plant about. You have to dispose of it at licenced places. Check out the Environment Agency website for proper guidance.

dougdeep · May 25, 2014

Moving is the easiest option. Honest.

The Brighton Buzz · May 25, 2014

jevs said:
There was something on countryfile about this. Apparently, you cut it off about 18" above ground and then pour in a very strong roundup mix into the hollow stems on a regular basis.

This Roundup for roots tree stumps etc. Piped into the stem at about a foot cut of from the ground does the trick. I had a load growing around the back of my house and it killed approximately 90% in the first year. Do it around September/October when the stems are full grown and then cut them down to about a foot at one of the notches. Then spike with a screwdriver and pipe in a solution of the Roundup as per instructions. This will then get into the root system and kill it off. If the stems are too small then spray on the leaves.Digging it up does not work and tended to spread it more. I have now got rid of 99% since starting this 3 years ago.

TomandJerry · May 25, 2014

The decision was taken on 9 March 2010 in the UK to release into the wild a Japanese psyllid insect, Aphalara itadori. Its diet is highly specific to Japanese knotweed and shows good potential for its control.

El Sid · May 25, 2014

TomandJerry said:
The decision was taken on 9 March 2010 in the UK to release into the wild a Japanese psyllid insect, Aphalara itadori. Its diet is highly specific to Japanese knotweed and shows good potential for its control.

Can you get these on Amazon?

TomandJerry · May 25, 2014

El Sid said:
Can you get these on Amazon?

Nope - but I wish you luck with your battle

pipkin112 · May 25, 2014

Raleigh Chopper · May 25, 2014

As far as I remember there are laws about Knotweed like removing and disposing asbestos.
Its a ******* to get rid of and best done by a specialist company who know how to really get rid of it and where to take it.
Be a bit careful if you DIY.
You are permitted though to fly tip it into a palace fans garden.

El Presidente · May 25, 2014

dougdeep said:
Moving is the easiest option. Honest.

Bye

ozseagull · May 25, 2014

dougdeep said:
Moving is the easiest option. Honest.

Depending on how close it is to the house it will cause some companies to withdraw mortgage offers. If picked up on the survey it will be the move falling through.

Triggaaar · May 25, 2014

dougdeep said:
Moving is the easiest option. Honest.

This.

blockhseagull · May 25, 2014

I believe it hates copper, I know you can get a geotextile with a copper layer which stops it growing.

The Antikythera Mechanism · May 25, 2014

dougdeep said:
Moving is the easiest option. Honest.

You have to declare, when selling, if you have or have had Japanese Knotweed

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