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 for helping recover from stress, but does it also improve the overall quality of the grow?

anyone

dude, i used it too. Ive used it twice. I cut the strength a little and applied it over a few days.

http://boards.cannabis.com/indoor-gr...tml#post993789

hello mate you should use s-thrive in every watering apart from when you flush,sorry dont use pk13.14i use canna boost:S5: