Inducing plant to flower more

I have a Blueberry Jack that was a clone and not knowing much about clones, I put it outside end of May, as I prefer outdoor growing, it didn’t take long before it stated to flower. I’m thinking of experimenting by putting it into more darkness by covering it around 4- 5pm r, gets dark here about 8pm in the OC, right now we have abot 14 hours of daylight, which would bring it to 11 hours of daylight and or can cover it sooner, this would give 13 -14 hours of darkness. I appreciate your opinion. to be correct… I CAN POST PICS. IN THIS SECTION