Posted: 16/04/2014 at 21:46
The grass will be quite weak due to lack of light which is the reason for feeding initially before using a weed and feed product. It gives the grass a boost. I used that method last year as the grass in this new garden was very poor - like yours- lots of moss and weeds.
You could scarify first to remove as much moss as possible, then use a feed only. There are lots of different ones available - just choose one to suit your budget and apply it when the ground is damp. Wait several weeks to let it take effect, and to allow the grass to grow a bit, and most importantly, when you mow - don't scalp it. Little and often when you cut. Once the grass is growing well - about 4 to 6 weeks after you've fed it, apply a weed and feed product which will kill the weeds and feed the grass again. That should get the grass growing well which is what helps to give it the upper hand and prevent weeds dominating. You may need to give it another application later on in summer. The reason for applying to damp ground is to avoid scorching which is what all chemical weed/feeds will do on dry ground. Timing is quite important with them too - if there's no rain a few days after applying you'll need to water it in. The ground might be a bit compacted too, and you could spike it to help open it up, but you can do that later on in summer if you prefer. Hope that's a bit of help and I've not confused even more!