Posted: 13/04/2017 at 18:40
It's probably lack of moisture Cathy. Sandy soil drains quickly and has less nutrients, so it may be that if you really want grass there, you'll just have to keep feeding and spending time on it. I don't think there's an easy solution unfortunately.
You could try using a grass seed which is suitable for your soil, and sow it mixed in with a little topsoil to give it a chance to germinate, and then feed regularly with something like seaweed which will help to boost growth. You'll need to water regularly too.
It might be easier to get rid of the grass altogether though, and opt for soemthing else. Often we have to admit defeat, even when we desperately want something!