Pk 13/14

im currently in the 1st week of flowering. im using coco + clay pebbles. im using canna coco A B for nutes. ive no boost but im getting some at the end of the month. but ive got canna PK13/14 can i start introdusing PK 13/14 now with my A B nutes or should i do as it says on the bottle and use in the 5th week of flowering for 1 week and just wait till i get the boost. im new to this and ive made so many fuck ups im supprised ive got this far but i have and they are looking gooooood. but i wanna make the best of this so i dont wanna introduce pk 13/14 now if i shouldnt. any answers appreciated. TY

best to stick to the instructions and use 3 weeks before harvest.
although i so know growers that use it for longer periods than that.

not long now til end of month so I would wait and buy some Top Max or Dr Hornby's Big Bud, and wait to use the PK later on.

that's what i'm using and they're doing great. sometimes i don't use as much of the additives as they suggest though..

cheers all. and thnx 4 the chart. i dont usually post but i was trying to find a post on this and couldnt so cheers.

im trying canna boost i think sticking to the same will just keep me right. but as usuall funds and my elec bill are stopping me buying what i need. but thanks 4 the input