Boosters How Long In Flower

How long in flower say a 8 weeker in flower plant, take will a plant uptake Phophourus, and for how long before it starts useing
potassium at the end of flowering, im useing canna Pk, but want to switch to a main potassium based fertilizer/additive :cool:
 
How long in flower say a 8 weeker in flower plant, take will a plant uptake Phophourus, and for how long before it starts useing
potassium at the end of flowering, im useing canna Pk, but want to switch to a main potassium based fertilizer/additive :cool:
Dang I was hoping you got your question answered because i wanted to add a booster...
 
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