On Sat, 1 Aug 2015 11:44:11 +0100, "ag.richards"
wrote:

Hi going to put some all year round plants in this year,just covered my
garden with stone and a membrane
but underneath there used to be a lawn not a very nice one full weeds and
stuff,just want to know the best way to go
about this does the soil underneath need treating or can I plant straight
away any advice most welcome what sort of
plants etc,Thx in advance T.R.

Not sure what you mean by "stone". Do you mean paving slabs, gravel or
something in between? If you have a membrane you presumably mean
gravel of some sort.
The best thing to do would have been to use Glyphosate on the weedy
lawn before putting down the membrane. You need to leave it all
covered to give time for the stuff underneath to die off in the dark,
ideally waiting long enough (?) before you plant through the membrane.
There will be weeds that get through anyway from seeds in the soil.
You will just have to be vigilant.