Hi Kat, <img src="/images/graemlins/smile.gif" alt="" />
It is best to get rid of all the weeds first if you can!
It will make your life easier later.
You can get rid of the grass by lifting off the turf and then use it for composting.
If you clear the space it will be easier for you to plan your Enlgish Garden.
If there any plants you want to keep then pot them up or move to a bed of their own while you sort out the garden.
Hellie
English Garden Walking