Nice one, good people are talking about it in a positive way after the past 6 months. The garden's looking absolutely stunning at the moment
If anyone's interested...please have a look and post some comments https://www.facebook.com/PrestonRockGarden
Firstly, you need to find out what's causing the brown patches. Could a dog be wee'ing on it ? Might be chaffer grubs or leatherjackets (daddy-long-legs larvae) eating the roots. A photo would help.
Personally, i buy a small bag of grass seed and thinly go over the entire lawn with it every...