I have a back garden approx 30 feet by 20 feet (side access with good parking) which is mostly rough grass. I need to have it cut on a regular ( say 2 weekly ) basis in the growing season, and any debris taken away. It could hardly be described as a lawn, so any help with improving it and keeping it better would also be welcome, but (as I have a dog) it will never be perfect, so I don’t want any chemical treatments to be used.