A healthy dark lawn will stripe up better.Lawn fertilizer with added Sulphate of iron(FeS04)brings out colour.Leaving it long is a good idea(more leaf to lay down)Increase cutting. Follow old stripes before they are lost and try to go over the stripes in the same driection as before.Light stripes the grass is laying away from you dark stripes they are laying towards you
Any suggestion of a good fertilizer with sulphate of iron?