when do i change to flower nutes

as above im using canna aqua vega at the mo ive vegged for 4 weeks and i swithed to
12/12 flower on the 21st april im still using veg nutes when shall i swop over to canna flores nutes how long into flower.also when do i start counting flower times from th day i switched to 12/12 or when 1st flowers appear on mj manythanks

come on whats up with this place latley no one replies wtf

You should switch to flowering nutes as soon as you flip the lights. Once your in the 12/12 cycle the plant will want more phosphorous then nitrogen.

I think it's pretty much obvious. Flowering nutes->when flowering->when switching light cycles. That's why ''flowering nutes'' have the word ''flowering'' in them.