Japanese Knot Weed (Merged)

roses

cornishpirate wrote: »

I have battled with a couple of patches of Knotweed for 5 years now.

The most effective killer I have found is glyphosphate. I sprayed every new bit of growth every month on the 1st weekend of the month without fail. When the leaves and stems have died back I would dig the bottom of the plant up and burn it.

This year apart from 4 new shoots I am Knotweed free!

Rathere than get Roundup (brand of glyphosphate) I went to the local farmers store and bought it in bulk at a fraction of the price of Roundup.

CP

I got case of JK . Who sells glyphosphate?

janeawej

i last got a supply at a diy place, dont buy roundup as stated as this is branded and much more expensive, ensure you get glyphosate as this is systemic and kills the roots as well as oposed to paraquat/diquat which kills only the top of the plant, dont buy a weedkiller with is 'fast acting' as this will be paraquat and not kill the roots, glyphosate will take several days before you see any effect, then the plant will gradually wilt, turn yellowy/brown and die, for JK retreat every month as said before as soon as you see new green growth, treat in the growing season as it will be absorbed quicker then, some local councils will treat it for you so it may be worth ringing to find out, good luck, Jane

paddy's_mum

You may be well advised to take a many pronged approach to this pestilential weed. It is definitely a plant that if you give it an inch, it will take a mile.

I once had a large clump in the garden of a house I bought in the late autumn and didn't see until the following spring.

I hacked it down (burnt the clippings on the open fire in the living room) then used roundup on it throughout the summer, attacking every single bit of regrowth. Late in the summer, I hacked it again, allowed a week or so for regrowth, reapplied roundup and then covered it for the entire winter with a thick lump of old foambacked carpet.

Although it tried in a feeble way to return in the spring, I went through the whole sequence again and by the following spring, it had well and truly died and never returned.

Solomon_Broad

If it isn't in your garden yet, now is the time to prevent it from getting in.

Get some pond liner (thick rubbery plastic), and dig a trench at the border of your property, and sink the liner into it. Go as deep as you can (at least a spit) for as far up the garden as you can. JK has very thick roots, so you need something heavy duty to stop it.

This might not stop it from getting into your garden, but it will slow it down, and give you a chance to kill it off. Also ask your neighbours if you can treat it in their garden too.

roses

Went to Homebase this morning & bought 2 bottles of glyphosphate spray at £3 each (1 litre spray bottles). I also bought something called Deep Root which you dissolve in water which you put on the weeds but it is not harmful to the soil meaning your other plants won't die.

http://www.ahsdirect.co.uk/product/227/82/

This was £5 for 0.5kg at Homebase

I also bought that sodium granuales which I will put on the gravel as the japaense knotweed is also growing there.

So a busy weekend for me

elsien

Help!!! The next door house has been bought by a property developer who is notorious for spending as little as possible. His garden was overgrown by japanese knotweed which he has refused to do anything about as the treatment quote was about £500.
Although the council said they couldn't force him to do anything, they agreed to do a one off treatment for him, after much nagging from me.
This has worked on the main bit of his garden, but while building an extension he dug up the communal alleyway (householder's joint responsibility) and it is now coming up all the way along. This is a real worry, as it's where the drains run to my house, and I'm worried the roots are going to damage the drainage system. It won't affect his drains, as he's on a seperate system. The other householders don't seem to care.
The council say not to use sodium Chlorate (pathclear) because it's close to a water supply. They advise I use glyophosphate, which doesn't seem to be touching it, and is costing me a fortune.

Anyone know any cheaper / more effective ways of getting rid of the stuff?

(Forcing the guy to do something isn't an option. I can't afford a civil case - he's a millionaire and I'm not!)

alanobrien

Napalm it from Orbit, its the only way to be sure you will get it all !

ok, serious head back on . You could try Sodium Chlorate.
Its cheap and cheerful and effective to an extent but dont get it near anything you want to keep.

Trishh_2

There is legislation in place for this weed, though Im not sure how you'd go about it all. some info: Japanese Knotweed is regulated by several pieces of legislation, the main being:

• The Wildlife and Countryside Act (as amended) 1981
• The Environmental Protection Act 1990
• The Environmental Protection (Duty of Care) Regulations 1991
• Third party litigation where damages may be sought for allowing Japanese Knotweed to spread onto other properties.

This puts a duty of care on the landowner with Japanese Knotweed infestations to be proactive in the control and eradication of it. Planning permission will also generally be refused without an eradication programme in place for the infestation.

Souce of info http://www.ecocontrol.co.uk/Pages/Japa_KnotwedLaw.html

relay

You've probably already tried it but if you can bash the stems/roots about with a stick to bruise them they take the weedkiller up more readily through the damaged parts.

Knotweek has over the years build up a resistence to certain weedkillers. If you can be sure there wont be any spillage to contaminate the watercourse then why not give pathclear a try as long as you are careful?

elsien

Trishh wrote: »

infestations to be proactive in the control and eradication of it. Planning permission will also generally be refused without an eradication programme in place for the infestation.

Souce of info http://www.ecocontrol.co.uk/Pages/Japa_KnotwedLaw.html

Unfortunately he's already done the building work, and no-one did anything about it. The council is now saying there is nothing they can do to make him shift it.

So you folks all think sodium chlorate is ok to use near a drainage system ?- don't want to end up poisoning a river or anything.