Compost, the cheapest that receives very good recommendations is JAB multi purpose + JI read this
topic! While the base nutrients in JAB are only partly organic, they will have been used by the time you get to flowering when you should start useing an organic nutrient, this gives a very nice sweet smoke.
Personally I use PM+ Soil Supreme compost that only contains natural nutrients, again personally I would not call it organic because it uses peat, but other than that its as organic as it gets. Its more expensive than JAB + I have grown with both PM's. PM's has it for me on bud smoke quality, flavour and all round smokability, I smoke neat, so how bud burns is very important to me a few quid more on compost matters little to me, yields are on par, at the end of the day its down to the smoke you like best, both produce very good quality buds, given good genetics are being grown.
I was not being rude, but all some people are interested in is quantity, I was trying to explain, monster bloom is just Monopotassium phosphate with a pinch of epsom's mixed in, that is all it is, both are cheap to buy if that what you want, I was just trying to give you best advice what ever your choice was.
Grow shops just sell you product, its not about good advice, but mostly about profit, here at uk420 it is about growers, members who mainly provide for their own consumption, they try everything, while opinions will vary, what people say is what works well for them and provides them with quality smoke, if they say, all I need is xxx its the best, they mean it from personal experience..