New lawn laid last summer. Coming along well enough. Was really green til I started cutting it about 6 weeks ago. Now had a couple of cuts and although growing has lost the lush green look. Any suggestions best feed to give it? A lot on the market seem to incorporate weed killers which I know I should avoid at this stage with developing lawn. Ground poor enough drainage..... Done some work on this but site is filled and in area of boggy land so will never be perfect. Just wondering if I should go for anything specific or just good old 10-10-20 or suchlike. Thanks