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I have recently taken over my aging aunts garden responsibilities. I think I may have been mowing over Japanese knotweed shoots. I have since used the same soiled mower/strimmer etc on my garden.


Is this a big mistake or can you uses the same tools mowers etc without cross contamination?




I have no first hand experience of JKW but I've heard that every little bit grows. But that may be just the roots, what you're mowing will be leaves. You say you think you've been mowing it. If you're not sure post a pic here to ID it. If it's in the lawn there'll be some growing away elsewhere for a photo

Unfortunately not I will have to wait for some regrowth


If it's JKW you won't have to wait for long 

Matthew Adams

Unforunately Japanese Knotweed is hard to get rid of. 

There was a terrible article in the local of how stressful it can be to get rid of.

One other thing I would add is that when you do work with it make SURE you wash your boots or shoes as a tiniest bit can make it spread. 




Hi , when i used to do contract work for the local council cutting grass on garage sites, i was told not to cut any Jknotweed at all and report it. They said it can be spread from little saplings coming off the machines. I couldnt say if it true are not though to be honest 

Oh dear....doesn't sound good. I've had another look and found some more I think. I've attached some photos, can anyone ID this for me please? Thanks






That looks like bindweed to me

Thanks - I'm hoping that you are correct (unless of course that is also a problem plant!)


I agree with Muddy Fork. Looks like bindweed (calystegia sepium) to me too, David. A common, perennial weed that's a pain but relatively straightforward to deal with. If you do a search on the forum you'll find plenty of suggestions, tips and tricks for dealing with it! I think mowing will weaken it if you keep it up, anyway     Shame it's so prolific as the flowers are actually quite nice!!



Will folks please look at Newbie Gardener 2014 post about at weed, think that is KW.  


For bindweed in a lawn, you could keep mowing. If you do that every three days it will give up eventually.

Or you could use glyphosate gel stick  and paint on the leaves, but then you cant mow it until it has gone brown.


Scott Edwards

At RHS Wisley, I believe they plant a wooden post close to any bindweed for it to wrap around and grow up. They then treat it with a weedkiller (rubbed directly onto the leaves rather than spraying) which then goes down and kills the roots. Whilst bind weed is a nuisance its not the nightmare that Japanese Knotweed is. You'll be glad to know that there's no need to lose any sleep!  

Knotweed does not keep to itself and to think it does is  foolish.  Time to control it is when it's small.  Here in Cornwall it is widespread and I'm not sure anyone is really able to kill it


mercifully I've never had to deal with Knotweed, however I did  read of one control method with , allegedly , good result. Cut the stems to expose the hollow centre, then apply concentrated glyphosate ( roundup ) into those hollow stems. I guess you'd need a very small funnel or an eye dropper. 

Thanks all. I am now very convinced that the photos above are bindweed, however on a less positive note, we have also definitely found knotweed on another part of the garden

I've been reading up on it and is the concensus that it is better to treat with glyphosate repeatedly rather than trying to dig it up? Currently the shoots are only a few inches high and still red. Is it best to treat while it is so small?


Oh yes!!!  Start as you mean to go on!!!