Posted: 28/03/2014 at 15:35
You'll need to reseed that lawn. If its damp and shady then get a seed variety specifically to suit. Leave it till its' about 3 inches and then cut with the lawnmower set to one inch. Don't feed or weed it till its established, it can take a whole season depending on your conditions, but at least 3 months. When you can see only tiny area's of soil between the grass plants, then it's established. Give it time.
If you have leather jackets, water with nematodes, directions on the packet