I add it during the whole grow… I just reduce nitrogen in flower…
P.k. 13/14 Is typically used at the 3-4 the week as a booster for a week or two tops.but like @Ladithief mentioned best to use base nutes including p.k thru whole flower cycle some use p.k. booster at end near 6-7 the week but imo that’s late and misses the mark
Ok 3-4th weeks
Of flower yes.i wouldn’t use it more than 2-4 times once is all I do when I use it just to be safe
Do I just at it to my nutrient tank and feed all week?
Yes for a week