Help needed with lowlifw automatic bb please

I have some auto blueberr
ys going and they are 30 days old and have had pre flowers for about 10 days but no other sign of flowering just the pre flowers its had for 10 days also there getting big ll are about 20" the breeder says they get 10 to 14 so I'm a little confused and could use some help do I put them on 12 or let them go?
 
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