I'm not so sure but even if it does kill the grass, it will make a very poor base for planting into. In the long run it would be much better to lift the grass and dig the soil well, adding compost and possibly a bit of B.F.and B. it will take more effort but pay you back for years.
The best time to do it is now (autumn), and you'll have to wait until late winter/early spring before digging in, so you'll have to be patient. The first time I used that lasagna method, I did just that (waited 6 months) and the result was perfect. For my second attempt I laid out the lasagna and waited only 2 months, and the result was not so good.
In my experience there are weeds, and then there are WEEDS
I sincerely doubt whether the lasagna method will get rid of deep rooted creeping thistle, perennial stinging nettles, hedge bindweed, ground elder etc in six months, especially over the winter when these plants are more or less dormant anyway.
I'm sure it'll deal with chickweed, groundsel, plantains etc - but so would hand weeding and forking it over followed by an occasional sortie with a Dutch hoe to deal with seedlings.
Last edited: 07 October 2016 08:34:16
“I am not lost, for I know where I am. But however, where I am may be lost.” Winnie the Pooh
I guess you are right about weeds and grass. I can attest that the lasagna method works fine on a well-kept lawn (free of most of the nasty weeds you mention).
Ok, i will try to just put the soil on top as i dont have any patience and i am planning to have a hedge and a lot of spring bulbs in there, and i want flowers next year?
It does not really matter if some of the grass will come back as long as it does not get a lawn.?
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I think so!
Yup!
I'm not so sure but even if it does kill the grass, it will make a very poor base for planting into. In the long run it would be much better to lift the grass and dig the soil well, adding compost and possibly a bit of B.F.and B. it will take more effort but pay you back for years.
When I need to extend an existing mixed border into my lawn, I use the so-called "lasagna method". See for example http://everydaygardener.com/the-lasagna-method-get-rid-of-weeds-and-sod-the-easy-way/
The best time to do it is now (autumn), and you'll have to wait until late winter/early spring before digging in, so you'll have to be patient.
The first time I used that lasagna method, I did just that (waited 6 months) and the result was perfect. For my second attempt I laid out the lasagna and waited only 2 months, and the result was not so good.
This autumn I have decided to do things correctly again and I will be patient. See some photos on my site at http://www.rezeau.org/wp-garden/en/september-small-jobs/
In my experience there are weeds
, and then there are WEEDS 
I sincerely doubt whether the lasagna method will get rid of deep rooted creeping thistle, perennial stinging nettles, hedge bindweed, ground elder etc in six months, especially over the winter when these plants are more or less dormant anyway.
I'm sure it'll deal with chickweed, groundsel, plantains etc - but so would hand weeding and forking it over followed by an occasional sortie with a Dutch hoe to deal with seedlings.
Last edited: 07 October 2016 08:34:16
AND IF YOUR GRASS INCLUDES THIS TYPE OF GRASS
https://www.rhs.org.uk/advice/profile?PID=283
YOU WILL NEVER BE RID OF IT, NO MATTER HOW MUCH TOSSING AND TURNING YOU DO.
If you live in Derbyshire, as I do.
@Dovefromabove,
I guess you are right about weeds and grass. I can attest that the lasagna method works fine on a well-kept lawn (free of most of the nasty weeds you mention).
Notice you said 'most' Papi Jo
... I haven't got any of those in my lawn 
... but I have got more achillea than I can shake a stick at 
Ok, i will try to just put the soil on top as i dont have any patience and i am planning to have a hedge and a lot of spring bulbs in there, and i want flowers next year?
It does not really matter if some of the grass will come back as long as it does not get a lawn.?