True Hugh Jarse, also the grass is partly what you make it.
You can piss on your patch of grass and it'll just get browner, or you can sprinkle fertiliser and water on it and make it greener. Unfortunately, sometimes you've just got a piece of crap grass and there's nothing you can do about it other than find some different grass.
There also seem to be some people who can be placed on a nice patch of freshly mown, green grass, but it dies and turns brown as soon as they touch it. Stay away from those people
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