I agree with Lyon and Berghill to an extent but the OP has 840 m2 which has been 'neglected' for over 10 years and I'm sure you would agree that that should not all be left to nature if it is to become a garden eventually? I deliberately let certain 'weeds' grow (always pick fresh young nettles 'around' Good Friday for nettle soup for examlpe) . If the main gardening project is not to take place for a while then there needs to be an ongoing control/maintenance of the 'weeds'.
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I agree with Lyon and Berghill to an extent but the OP has 840 m2 which has been 'neglected' for over 10 years and I'm sure you would agree that that should not all be left to nature if it is to become a garden eventually? I deliberately let certain 'weeds' grow (always pick fresh young nettles 'around' Good Friday for nettle soup for examlpe) . If the main gardening project is not to take place for a while then there needs to be an ongoing control/maintenance of the 'weeds'.