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Because I prefer to have a maintenance free lawn which doesn't need anything doing to it for the next decade. I don't have to own a lawnmower, i don't need to weed it & i don't need to water it during our scorching summers ;)
There are plenty of organic things in the rest of the garden. I'm less than a 90 second walk from a large park and less than 5 minutes from Bromley Common which, last time i checked, had enough grass in it for the rest of Bromley twice over.
And yes, if i really want, i could vacuum the thing. In reality, i'll give it a brush once a month for most of the year and once a week during the autumn when leaves are dropping.
Danone