Plants not flowering - UK Outdoor

Frankie1

Member
Hi,
I have 7 plants in my greenhouse. I'm in UK and none of them have started flowering yet. I'm getting worried as its late and im scared the cold is going to get to them before their ready for harvest. Light still hasn't reached 12 hours. Is there anything i can do to get them into flowering e.g. covering them up after 12 hours of light ? I dont have the option of moving them inside as their in the ground.
 
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