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Ground elder returning

I manage a very large allotment area, which I left for 5 years to go sailing.
Ground elder is now well established in several different areas.
I used extra strong glyphosate a few months ago, which has virtually killed it all but I can see seedlings emerging again.
The advice is to let it grow give a good leaf surface.
Won't this allow the root system to grow back? Or is it a case of gradually weakening it over a couple of years (one poster suggested 3 sprays a year over 2 years)?
That means not growing on these large areas for a considerable time.

My other problem is that there are three other people on the allotment area, all of whom are against spraying. I have explained the problem, the science and the inevitable takeover of the area and spread into neighbouring gardens and surrounding woodland.
I want to screen the areas I control with havey plastic (I have 100sqm). How wide to ensure it doesn't spread underneath? I have seen it travel at least 2ft under path matting, emerging in the middle through a small hole and wood chips.

Lastly, would spraying and then covering in plastic work better?

Posts

  • BobTheGardenerBobTheGardener Posts: 11,385
    If they are seedlings, you can just hoe them off.  If they are coming back from pieces of root which survived the glyphosate, then best left to grow a decent amount of foliage before spraying again.  I think you need to do some investigation of the roots to identify which.  Covering areas often doesn't work, as the roots just keep on spreading horizontally and will break the surface wherever they find light (usually, around the edges of the covered area.) 
    A trowel in the hand is worth a thousand lost under a bush.
  • Thanks. They won't be seedlings as I never let them flower. I scythe the allotment. 
    So it looks like I'll have to keep on spraying right up to the neighbours' areas and watch it gradually spread all around me. Such a shame. Eventually, the whole area and some gardens will need to be sprayed, killing everything for a year or two. 
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