grass seed not germinating
hi there, i recently sowed some new grass seed on my very patchy back garden, this was carried out on the 31/03/2014. Before sowing i carried out lawn aeration, and scarification. i gave the soil a really good rake, put a few new bags of top soil on and mixed in a lot of grass seed into the bare patches.Its been almost three weeks now and apart from a few new blades of grass i'm very disapointed in the out come.
I'm not not sure where i've gone wrong, the temperature hasn't been the warmest, which i know can effect the seed. I only have watered the ground when it has looked really dry.
Any tips or help would be very much appreciated guys, thanks for reading