Canna Coco and PK. When to use?

I recently made the switch to Canna Coco and am currently in the middle of my first grow with this medium.

I just flipped the lights to 12/12 the other day. I've always harvested this particular strain (Kandy kush) 60-63 days after going 12/12.

Now, at the moment I'm just using A+B with a little bit of Calmag.

At what day in this 60-63 day window should I feed with PK? Do I do it just once or during all my feeding for a week (I water with A+B every 3rd to 4th day).

And do you cut back on A+B when you use the PK?

I've read so much conflicting information on when to use PK and how much (i.e., once or during all feeding for a week).

Thanks

Check out canna's grow guide... http://www.cannagardening.com/growguide

The rule of thumb is add P/K to your nutes after 6 weeks of flowering. You keep adding it for one week at every feeding and also during this week your ec is at it's highest level.