hello mate you should use s-thrive in every watering apart from when you flush,sorry dont use pk13.14i use canna boost:S5:
xxxhazexxx Reviewed by xxxhazexxx on . Canna PK 13/14 and superthrive Hi, I'm just chekin quickly. I have used Canna PK 13/14 on almost all of my grows so far. Being a soil grower, and the instructions are related to hydro growing, I have only used it on one watering 3-4 weeks before harvest, just to play safe. I was wondering if using it more than on one watering would be a problem and would it be more effective. Also, I have heard good things about superthrive and was wondering if you guys think I should get some, I'm about 1 month into my grow. I've read it's Rating: 5