I begin with Full Up 1/16 tsp per gallon starting at week 2. Also starting that week 1/8 tsp per gallon of Kelp is added once weekly until week 4, or until first signs of trichome production. At the first sign of trichome production, I incorporate 1/16 - 1/8 tsp per gallon of NPK Silica mixed with the Full Up (no Kelp) daily until 2 weeks pre harvest to encourage plentiful trichome production throughout flower. Edit: almost forgot...( and lastly, I use Neptune's Harvest when I see the basic deficiencies)