I've always used all 3 and not had a bad stretching problem, but that is because of high light intensity...

The lucas formula as I understand it...Gen was close and ICEToker was right about values, but Lucas came up with this formula to be used with perpetual growing of clones SOG and whatnot...So he did not need nitrogen, he wanted the plant to concentrate on budding...Imho.
latewood Reviewed by latewood on . Lucas Formula when using LF do you include additives in the 800ppm ceiling, ie. floralicious plus, green fuse bloom, silica, epson salts, chi, koolbloom, etc... OR do you just add them after you have 800ppm with GH bloom and Micro??? Rating: 5