japanese knotweed

magicbastarder · 24-10-2018 12:47pm

it's not. it's a willowherb, i think - rooted in the cracks in the patio rather than actually growing up through it.

my3cents · 24-10-2018 1:03pm

magicbastarder wrote: »

it's not. it's a willowherb, i think - rooted in the cracks in the patio rather than actually growing up through it.

fyp

magicbastarder · 24-10-2018 1:13pm

heh - though i think the first photo shows seedpods like you'd see on a willowherb?

New Home · 24-10-2018 1:26pm

I'd say that the first photo shows willowherb, and the second willows (there seems to be more than one).

my3cents · 24-10-2018 1:33pm

magicbastarder wrote: »

heh - though i think the first photo shows seedpods like you'd see on a willowherb?

Sorry, both in fact, but I picked on the willows as they are likely to be more of a nuisance in the long term if they get bigger and start moving the slabs around.

Citizenpain · 25-10-2018 12:35am

pawdee wrote: »

I'm 99.9% sure that it's not JK.

100% —get off the fence

pawdee · 25-10-2018 9:58am

Ok, on closer inspection I can say with 100% certainty that it's NOT Japanese Knotweed. BUT....... I'd still be VERY worried. How do we know that some rhizomes from my garden (in West Kerry) haven't grown underneath those paving slabs? As everyone knows, Japanese knotweed roots can grow HUNDREDS of miles in every direction. It can also burst through 6 metres thick of reinforced 40N concrete. Only the other day as I walked through my garden a stalk of knotweed that I missed during treatment SNAPPED at my ankle. Just be very, very careful is all I'm saying. Don't take any chances. Get the specialists in. They'll dress up like astronauts, fence off the area and spray 50 euros worth of glyphosate over a 3 year period. Believe me, it'll be the best 3k you'll ever spend!

Shefwedfan · 25-10-2018 9:56pm

Pacifico wrote: »

Have noticed the attached growing up through my patio recently...just wondering if it's possibly JK?! Apologies for the poor pics...

Some people are going a small bit overboard....

Do you have a license for proper weed killer? If not do you know a local farmer or relative

Get some proper Roundup or equivalent and spray the area.

Wait till the weeds die and then watch next year to see if it returns, then spray again....

Specialist and dressing up in astronaut suits for a weed???? spending 3k???? best money ever spent??? all craziness

http://theconversation.com/japanese-knotweed-is-no-more-of-a-threat-to-buildings-than-other-plants-new-study-99580

What they will do, even if they don't know its knotweed, because most of them have no idea what it is. They will mark your house as having infection. Then when you try to sell good luck to that.

Truckermal · 28-10-2018 5:02pm

I sprayed mine with Garlon a few weeks ago so I'm hoping it kills it! It's 65 quid for a 1 litre bottle!

my3cents · 28-10-2018 5:39pm

Truckermal wrote: »

I sprayed mine with Garlon a few weeks ago so I'm hoping it kills it! It's 65 quid for a 1 litre bottle!

Probably the wrong herbicide for the time of year but even so it won't have done the JK any good

Its not a weed you can get rid of in a season so its more a matter of getting into the habit of spraying it every year till it doesn't come back.

Garlon would be good imo for an early spray and a mid summer follow up. For the Autumn unless you have access to some of the newer chemicals I'd go back to good (or bad) Roundup (or other glyphosate herbicide).

Truckermal · 19-05-2019 8:26am

my3cents wrote: »

Probably the wrong herbicide for the time of year but even so it won't have done the JK any good

Its not a weed you can get rid of in a season so its more a matter of getting into the habit of spraying it every year till it doesn't come back.

Garlon would be good imo for an early spray and a mid summer follow up. For the Autumn unless you have access to some of the newer chemicals I'd go back to good (or bad) Roundup (or other glyphosate herbicide).

The Garlon completely wiped it out as a area that I couldn't spray has fresh growth allready so Garlon works!

pawdee · 07-04-2020 9:56pm

Spring update.......

I'm now at the stage where I've dug out all of the dead rhizome crowns and dead roots that I could see. I've leveled and raked the topsoil so, as soon as we can get our hands on some grass seed, we'll be seeding the lawn. It's taken almost 3 years to eradicate a patch measuring roughly 40 x 7 m. I set a lawn on the first area I treated 2 years ago and nothing has come back since. In the more recently treated (and much bigger) area about four shoots have appeared this spring. Given the jungle that was there I'm not overly surprised or concerned. I'll leave them alone until late summer / autumn and then blast them with Roundup.

I don't want to get complacent and I'll be keeping a close eye on things from now on. It's a pity the previous owners allowed it to take hold to such an extent. It was literally a jungle and it took a hell of a lot of hard work to get rid of it. I used stem injection, cut and fill, and spray methods. All worked equally well. It was nice to have a beer in the middle of a nice level topsoiled garden yesterday evening with the moon rising and the birds singing. Felt like some kind of victory. I learned one thing along the way. It's one b*****d of a weed. I'll update again in the autumn and hopefully I'll have a nice lawn by then. I'll post some before and after photos to inspire others fighting the battle. Cheers!

Truckermal · 07-04-2020 10:03pm

Great stuff I only noticed today I have a few shoots coming up too but nothing like before, should I nuke these now with Roundup?

pawdee · 07-04-2020 10:38pm

Truckermal wrote: »

Great stuff I only noticed today I have a few shoots coming up too but nothing like before, should I nuke these now with Roundup?

I'm far from an expert and I'm sure a lot of professionals would disagree with the approach I've taken. However, my understanding is that if you spray knotweed at this time of year or in summer what you'll achieve is only top kill. I'd say you're better off letting whatever shoots that appear to grow until late summer / early autumn. Spraying them then will ensure that they draw the glyphosate down to their roots as they begin to hibernate for winter. As I said, I'm no expert and I've heard people say it's a good idea to zap them as they appear. It's tempting but if it was me I'd wait!

Shefwedfan · 07-04-2020 10:40pm

Truckermal wrote: »

Great stuff I only noticed today I have a few shoots coming up too but nothing like before, should I nuke these now with Roundup?

Nuke them

I seen some coming up the following year, nuked them and have never seen them again!!

dball · 08-04-2020 12:11am

dont spray them until they flower - probably late august or September is best advice.

Spraying now and they will conserve/use their energy that they have for growing above ground into their roots and crowns and will pop up in more places.

like a virus, slow and steady when the time is right. Not currently

beolight · 08-04-2020 9:28am

pawdee wrote: »

I'm far from an expert and I'm sure a lot of professionals would disagree with the approach I've taken. However, my understanding is that if you spray knotweed at this time of year or in summer what you'll achieve is only top kill. I'd say you're better off letting whatever shoots that appear to grow until late summer / early autumn. Spraying them then will ensure that they draw the glyphosate down to their roots as they begin to hibernate for winter. As I said, I'm no expert and I've heard people say it's a good idea to zap them as they appear. It's tempting but if it was me I'd wait!

Well done ðŸ‘ have been that solider in the trenches before. Many fond memories...... not ....my heart palpitations when that orange root Spaghetti junction can be spotted and then sieving every bit of soil around it for any small bit of it that may have escaped and then you spot the orange flesh glinting ( off roads from the spaghetti junction) at you in the next sod that has to be done that’s when you realise your in it for the long haul. Everyone got brushed with non concentrated round up just in case my heart wasn’t in it the next day

For now vigilance is the key another poster has asked about new growth appearing all I can say is what I done was wipe it with round up once i seen any growth at all Then I let it die off and then using a fiskars weed extractor I removed it you will get a golf hole size extract of the soil. Next you sieve it and you should be able to gently shake the soil of the JK if your lucky you will find the end piece where it shot up from if both ends are dead job done if any end ( piece) shows the shiny orange flesh when you break it you know the battle is not fully won but you know where to look

To original poster with a section that big ( mines was about 10m2 growing into neighbours) you will have missed small pieces, they might not shoot up this year but next year and the year after and after don’t let your vigilance drop

pawdee · 16-04-2020 12:28pm

Here's a before picture anyway (I hope)..........

New Home · 16-04-2020 12:32pm

:eek:

pawdee · 16-04-2020 12:34pm

I'm having awful trouble uploading photos. I tried compressing and all sorts but I'm not great at this kind of thing. Obviously! I'll have an after photo asap.

pawdee · 16-04-2020 12:36pm

pawdee wrote: »

Here's a before picture anyway (I hope)..........

BTW......this photo was from when I bought the property almost 4 years ago. The previous owner did all the hacking!

16-04-2020 1:27pm

pawdee wrote: »

I'm having awful trouble uploading photos. I tried compressing and all sorts but I'm not great at this kind of thing. Obviously! I'll have an after photo asap.

Try this,
https://postimages.org/

I havent used it myself but seen it recommended here.

Shefwedfan · 16-04-2020 5:06pm

pawdee wrote: »

I'm having awful trouble uploading photos. I tried compressing and all sorts but I'm not great at this kind of thing. Obviously! I'll have an after photo asap.

If on iphone, email the picture to yourself....it will then ask you to pick the size of photo and reduice to below 4mb....

pawdee · 16-04-2020 5:20pm

Ok, so I don't have an iphone but trying this:

https://postimg.cc/WFW3qCjJ

pawdee · 16-04-2020 5:23pm

That's the after shot anyway! Seeded it at weekend and set wild flowers along the borders. Hopefully I'll have a lawn soon enough.

beolight · 17-04-2020 9:03am

Keep a lookout for artichoke like sprouts shooting up if you see them ground is soft enough for you to carefully cut and dig out a deep square and sift through it carefully to find the offending twig

Drifter50 · 17-04-2020 9:10am

pawdee wrote: »

Here's a before picture anyway (I hope)..........

Anyone know what the council guys are using, that seems to demolish it in no time and leave a wasteland behind afterwards. I`ve heard they inject the root.
Whatever Leitrim County Council use its the business

GinSoaked · 19-04-2020 5:46pm

I doubt you can get it easily but Icade is one I've heard of https://www.pitchcare.ie/shop/professional-weed-killers-for-japanese-knotweed/icade-herbicide.html

If its killed everything then some form of glyphosate is probably what they use and its used to inject the stems then glyposate product every one knows is Roundup

keithm1 · 24-05-2020 2:16pm

I’m winning the battle against this stuff it seems
I had a section of garden about 10 meters by 6 meters really bad infestation huge rhizomes bulging out of the ground
I’ve been injecting and spraying the last 3 years and this year I have very few shoots so I’ll let them come up again and inject and spray

My question for any experts here is where can I dump the rhizome when I dig them up.
My plan is to dig them out and put immediately into bags sometime around September

mad m · 24-05-2020 2:27pm

pawdee wrote: »

Ok, so I don't have an iphone but trying this:

https://postimg.cc/WFW3qCjJ

Wow...well done

Truckermal · 24-05-2020 2:32pm

pawdee wrote: »

I'm far from an expert and I'm sure a lot of professionals would disagree with the approach I've taken. However, my understanding is that if you spray knotweed at this time of year or in summer what you'll achieve is only top kill. I'd say you're better off letting whatever shoots that appear to grow until late summer / early autumn. Spraying them then will ensure that they draw the glyphosate down to their roots as they begin to hibernate for winter. As I said, I'm no expert and I've heard people say it's a good idea to zap them as they appear. It's tempting but if it was me I'd wait!

dball wrote: »

dont spray them until they flower - probably late august or September is best advice.

Spraying now and they will conserve/use their energy that they have for growing above ground into their roots and crowns and will pop up in more places.

like a virus, slow and steady when the time is right. Not currently

Both of you were spot on I sprayed them and might as well have had put a bag of Nitrogen on them!

I have a huge improvement but as mentioned above injecting the stalks later in the year is the definitive cure!

GinSoaked · 24-05-2020 3:09pm

Truckermal wrote: »

Both of you were spot on I sprayed them and might as well have had put a bag of Nitrogen on them!

I have a huge improvement but as mentioned above injecting the stalks later in the year is the definitive cure!

The only reason to spray at this time of year is to keep the top growth controlled so its easier to get good coverage for the later spraying.

Efforts up to the end of the month and maybe mid June make it much easier to spray later on.

I've had stands of it that were a meter or more above the top of my head and needed a slasher to get into. Solution (other than spraying what I could at the correct time) was to knock all the dead stems over during the winter then spray twice early in the year with the last early spray at the end of May. Then by late August early September the JK was back up to about eye level, much less dense and far easier to get into spray.

You also eventually get to a point where the little bits that come back after a good Autumn spraying can't be left all year and you have to resort to spraying those little bits whenever you see then at every and any opportunity.

GinSoaked · 24-05-2020 5:42pm

keithm1 wrote: »

I’m winning the battle against this stuff it seems
I had a section of garden about 10 meters by 6 meters really bad infestation huge rhizomes bulging out of the ground
I’ve been injecting and spraying the last 3 years and this year I have very few shoots so I’ll let them come up again and inject and spray

My question for any experts here is where can I dump the rhizome when I dig them up.
My plan is to dig them out and put immediately into bags sometime around September

Thats a tricky question. Technically I think they fall under the same category as toxic waste if you take them to the tip.

The bagging idea is good any chance you can triple bag using heavy duty bags and bury them on your own your own land?

The few rhizomes I've dug out I've put few at a time into our wood burning stove.

24-05-2020 8:49pm

I'd burn them .

Hocus Focus · 25-05-2020 2:30pm

BrownFinger wrote: »

I'd burn them .

+1

New Home · 25-05-2020 10:26pm

Probably a silly question but... what would happen to the weedkiller in the plant when it's subjected to high temperatures? Maybe the dump and the toxic waste aren't such a bad idea.

GinSoaked · 25-05-2020 10:51pm

New Home wrote: »

Probably a silly question but... what would happen to the weedkiller in the plant when it's subjected to high temperatures? Maybe the dump and the toxic waste aren't such a bad idea.

Burn it bit at a time in a woodburner or outside and stand down wind?

The problem on a tip is that if you say what it is then either they won't let you get rid of it or charge you a fortune to take it.

New Home · 25-05-2020 10:52pm

GinSoaked wrote: »

Burn it bit at a time in a woodburner or outside and stand down wind?

The problem on a tip is that if you say what it is then either they won't let you get rid of it or charge you a fortune to take it.

Same thing with plastic, then?

Lenny17123 · 26-05-2020 2:32pm

Hey, I stumbled across this thread this morning. Unsure if what i have is Japanese knot-weed but i'd say it's fairly close to it. It seems to have come up out of no where this year. The problem is it seems to have set up in the tree line between my house and my neighbours and its only become noticeable as it has sprouted up above the tree's now.

Can anyone confirm if it is knot-weed or what i might be dealing with here?

GinSoaked · 26-05-2020 2:37pm

Looks like elderberry to me.

Lenny17123 · 26-05-2020 2:50pm

GinSoaked wrote: »

Looks like elderberry to me.

Thanks for that. Looking it up now that's exactly what I think it is. My fear's alleviated so.

Doop · 26-05-2020 3:15pm

This is an interesting thread...

I do think it maybe worth revisiting one of the initial posts... (albeit from 3yrs ago!)

Shefwedfan wrote: »

To answer main question. I bought a house, after I bought house I had gardener in. He spotted a small plant of it growing about 3m from house. I rang a friend and he brought over a surveyor. More or less the surveyor said I could hand the house back to the seller. If they wouldn't accept I could go after the estate agent for not telling me it was on property.....the seller would have to take back the house according to him. End of story.

It roots grow deep, if it gets a strong hold the root can grow under house and cause damage to the foundations. If you are selling a house you have to make the buyer aware of it.

Please note this is the info I was given.

I fear the above poster has been ill advised by the 'surveyor' in the story. (Surveyor is a very general term and can cover... Quantity Surveyors, Building Surveyors, Property Managers, Letting agents, Asset Managers, Estate Agents, ....all very different and distinct professions.)

There is no policy in Ireland of 'Full disclosure' Its buyer beware, the onus is on the buyer to do their own due diligence.

There is no system for a 'refund' on a house or handing one back due to a defect be it concealed or apparent..

A seller could actively (and often do) try to conceal an issue from the purchasers Building Surveyor. A surveyor can only deal with what they can see but are wise to such tactics all the same. A decent Building Surveyor will be aware of and look for Japanese knot-weed or indications of its presence.

GinSoaked · 26-05-2020 3:23pm

Its the UK where mortgages are affected by JK. If you have it and a surveyor from the building society or bank spots it then there's a good chance you won't get a mortgage.

26-05-2020 8:43pm

Lenny17123 wrote: »

Thanks for that. Looking it up now that's exactly what I think it is. My fear's alleviated so.

It should be flowing now,you can make cordial out of them.
For your gin and tonic!

standardg60 · 26-05-2020 9:05pm

BrownFinger wrote: »

It should be flowing now,you can make cordial out of them.
For your gin and tonic!

And wine! Even better.

26-05-2020 9:08pm

standardg60 wrote: »

And wine! Even better.

Oh hello.
How much do you need ..!

standardg60 · 26-05-2020 9:20pm

Depends on how much you drink!
The wine is made with the berries, never made it myself but have drunk it. Buckfast springs to mind!
I'd imagine there's plenty of info on the ould interweb.

Lenny17123 · 27-05-2020 10:06am

BrownFinger wrote: »

It should be flowing now,you can make cordial out of them.
For your gin and tonic!

standardg60 wrote: »

And wine! Even better.

Here was me thinking I might have a battle on hands getting rid of some form of weed to be pleasantly surprised that I can now make wine and cordial out of the berries.

I think I was just too focused on how fast it seemed to grow. I'd say its nearly 12 to 15ft high!

Pious14 · 27-05-2020 3:01pm

I don’t think this is JK but want to be certain before I go culling it. Any idea what it is?

Pious14 · 27-05-2020 3:01pm

I dont think this is JK but want to be certain before I go culling it. Any idea what it is?

japanese knotweed

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