question regarding p.k

im currently growing 9 plants in soil,the variety is a kush,not sure which strain.i water every 3rd day,the plants seem happy no problems.im using canna terra florra at a ratio of 5ml per litre of water and i am also mixing in canna boost at a ratio of 2ml per litre.each plant is having 1.5 litres on each feed.the temps are 75 and i have good exhaust fan running,2 oscillating fans so the humidity dosent seem bad either.the last time i grew like this the crop was ready after 12 weeks,i used a tiny drip of pk in the last 2 feeds before the 2 week flush.is this enough pk to use or can you use it earlier?on the canna boost bottle it says it works best with cannas pk but dosent state for how long.should i leave it to the last few feeds before flushing or can i use it more? thanks for any help!:hug:
 
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