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I am about to use weed killer on some thuggish weeds - and don't have to worry about killing off any cultivated plants - but how long should I leave it before I can plant anything else in the same patch? Hopefully I have added a picture. It is on our land and I don't think I need to be certificated to use weed killer - its only stuff from the garden centre. You can't see it but the border is contained by a wall that gets higher as you go down the hill. The grassy bit on the edge of the road is the councils land.




Depends on the weedkiller you're using - something like Weedol or Roundup, you can dig over and plant within a fortnight, once the weeds have died back in other words. Other, more heavy duty weedkillers may be present in the soil for some weeks. Also, depending on the variety of weeds, you may still need to dig out roots.

19 Aug, 2011


Thanks Bamboo. The weeds are mainly high grasses and something of the parsley family with enormous leaves and big roots. I have been meaning to tackle it for a couple of seasons but the road is really dangerous and there isn't much room to work in.

19 Aug, 2011


You'll probably find that after a few weeks your big leaved parsley type weeds will pull up quite easily. If you didn't cut the flowers off they will have seeded so make sure you watch out for seedlings next year.

19 Aug, 2011


It should tell you on the packet/bottle how long to leave the area before doing new planting, Cammomile. If the grass has deep, spreading roots you may need to weedkill a second time before they all die off. Even then you'll have to make sure you've got all the roots out because a lot of grass roots, i.e. couch grass, runs for yards and yards, and it's very difficult to get all the roots out, a bit like bindweed roots! Good luck. Annie

19 Aug, 2011


Thank you all, I shall take my life in my hands with the traffic out there and give it a go.

19 Aug, 2011


Don't get caught doing it if its public land, Cammomile - its illegal to use weedkillers anywhere other than your own territory unless you have done a course and have a certificate to prove it.

20 Aug, 2011


Might be better to use a watering can than a spray as there would be less danger of you accidentally getting drift onto the council's grass. The dilution is different but the instructions are on the pack. There are watering cans with flat roses designed for weedkillers as they are more controllable than the round ones, and its wise to use a separate one anyway. You could also put a big piece of card or plastic over the grass at the edge to protect it.

21 Aug, 2011


No, applies to perfectly ordinary, freely available weedkillers - though I have to say it doesn't stop me doing along a wall where it meets the pavement, or where the path meets the pavement outside - I don't have a certificate, but its only an inch or two, so I don't worry about it.

22 Aug, 2011


Banboo are you saying that it would be illegal to cut the top of wayside Japanese knotweed and pour a little of the stuff down the hollow stem (which works)? this is something I always promise myself I'll do and then forget about it by the time I get home.

22 Aug, 2011


All I know is when I did my training, we were told it was illegal to apply any herbicide to any public area without a Certificate.

23 Aug, 2011


Fortunately I have never seen any certificate inspectors down our back lanes so might still risk it if I ever remember! The council certainly don't seem to care much, judging by how much balsam there is down by the river...

23 Aug, 2011

How do I say thanks?

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