We haven't cut the grass that has been growing on site because we wanted it to stabilise the slope and prevent the runoff of muddy water that happened every time we had a heavy shower. Anyway it has been a few weeks now and the grass has turned into bush. The runoff is not so much of an issue now that the retaining wall is finished so we've just sprayed the bush with a systemic weedicide - it'll take a few days but it will be absorbed and go down to the roots and kill most of the bush.
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