The 24 hour fast acting stuff is particularly useless. You want a slow
kill over 2-3 weeks to have maximum effect using a translocating
weedkiller like glyphosate with the least amount of chemicals used.
I have cleared acres of stinging nettle and brambles with glyphosate
followed after it is tinder dry with a slash and burn. Doesn't look
pretty with scorched earth but it gets the job done. The you can pick
off any seedlings as they come up against the dark earth.
>
> I started off with nettles a couple of feet high across the back and was
> trying to get at them early b ut now they are 10ft high and have started
> to "march" across the lawn as the get bigger and more widespread.
Dunno what you are doing then. I allow nettles to grow in the wilder
parts of my garden as butterfly habitat. Seldom more than 8' high. They
stay put and are relatively easy to prize out with a fork when unwanted
(although I have broken a fork once doing exactly that).
>
> Nothing has worked. I know putting a bonfire on the ground clears it for
> a time ( and then they start again.
>
> I have tried smothering the ground with thick carpet but they grow through.
It should take them a couple of years though.
>
> This isn't a few dandelions in the patio - so what is there that will
> work? And the green wellie chemical free brigade can come and hike in my
> stinging nettles and see how they like it, if they want to object - I am
> pro anything that will do the job.
For a small area I would just go for physical removal they are fairly
shallow rooted and the roots are bright yellow so hard to miss.
You don't give any indication of the scale. A few square metres to an
acre I would use a hit of generic B&Q glyphosate (the stuff you buy as
concentrate and dilute to use) with a wand sprayer or backpack.
Do not buy the prediluted stuff. It is vastly overpriced impure water
with a huge profit margin. There is no real skill to mixing your own
weedkiller although failure to mix it up properly might explain your
failures. I am pretty certain everything apart from holly and ivy that I
spray with glyphosate will be dead within three weeks.
Nettles show yellow new growth just after a week and in their weakened
state physical removal becomes fairly easy.Wear gloves and chop the tops
off first to avoid getting stung unnecessarily.
--
Regards,
Martin Brown