I feed mine from the first feed (1/4 strength) with grow nutrients and a root stimulant and double the strength each time so the third feed is at full strength (usually around the end of week two). I know that goes against the gospel 'no nutes for two weeks' crap that I keep seeing everywhere but that's how I've done it for years now and would definately never go back to the 'gospel' now
Cheers,
Hardon