I am a first time grower and growing a few "early girl" strand outdoors and was wondering whats the best type/kind of fertilizer to use. Currently i have been feeding them once a week with 20/20/20. A friend suggested to use different n/p/k mixture but dont know what,for how long and when and if to change after so long? Any help would be great. Also what about granule fertilizers? The local garden center sells a bunch of different mixtures.