lovely looking plants man, great work.
you can add pk as soon as they have the first real flowers, normally about 14 days into 12/12. only add about half dose and reduce the normal nutes a bit too. only use it for a couple of waterings, then go back to A+B until 3 to 4 weeks before harvest when you can add another dose of pk, this time full dose on top of your normal nutes. unless she is nute shy in which case yu reduce the normal nutes a bit before adding the pk.
peace
you can add pk as soon as they have the first real flowers, normally about 14 days into 12/12. only add about half dose and reduce the normal nutes a bit too. only use it for a couple of waterings, then go back to A+B until 3 to 4 weeks before harvest when you can add another dose of pk, this time full dose on top of your normal nutes. unless she is nute shy in which case yu reduce the normal nutes a bit before adding the pk.
peace