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Sowing seed in ex-knotweed area


 I know there are thousands of articles about this weed and I'm sure it gets a lot of coverage on these forums. But, I feel I have a specific question:

 Is it ok to sow/grow grass seed on an area where knotweed has been?

 A third of the lawn is grass, 2/3s soil. Knotweed was there, but was nuked by some specialists a year or so back. Would I be encouraging knotweed to come back by looking after that section of the garden?

 Also, there is actually gradually some knotweed growing - very small so far on the massive soil patch. Could be dealt with separately from wanting to sow some grass seed?

 Essentially: Will this section of lawn need to be eradicated again when knotweed comes up? 

  Just to say - I am a tenant in this place, not buying it! But all the same keen to get the lawn looking nice(r).

 Any pointers much appreciated.




  • JennyJJennyJ DoncasterPosts: 7,658
    I think you need to get the knotweed dealt with before trying to grow anything close to it.

  • Hi Jenny,

     I thought that would be the first answer on these forums!

    But the point is, I think it is an inevitability that the knotweed will be always existent, despite it being dealt with again. i.e., always present under the soil even if it's not visible.

     I do hope this isn't the case which leads me to my next question: Can J Knotweed be eradicated entirely?


  • GemmaJFGemmaJF Posts: 2,286
    edited April 2020
    Isn't the 'official' treatment to remove all the soil? I've only come across dealing with it on commercial projects where Natural England guidance is that any affected soil is removed completely and disposed of at the cost of the developer. I'm not sure what 'some specialist' is, if they left it in the ground, as it will definitely be back with vengeance and it does not follow the guidelines for eradication. 
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